RADREVIEW EASY: IMAGE PRODUCTION
Image quality in digital fluoroscopy is influenced by 1. pixel size. 2. contrast. 3. noise.
D 1, 2, and 3
In which of the following ways might higher image contrast be obtained in abdominal radiography? 1. By using lower kilovoltage 2. By using a contrast medium 3. By limiting the field size
D 1, 2, and 3
The batteries in battery-operated mobile x-ray units provide power to 1. the x-ray tube 2. machine locomotion 3. the braking mechanism
D 1, 2, and 3
The effect described as differential absorption is responsible for radiographic contrast a result of attenuating characteristics of tissue minimized by the use of a high peak kilovoltage A 1 only B 1 and 2 only C 1 and 3 only D 1, 2, and 3
D 1, 2, and 3
Which of the following can affect histogram appearance? 1. Centering accuracy 2. Positioning accuracy 3. Processing algorithm accuracy
D 1, 2, and 3
Which of the following can minimize magnification seen in a radiographic image? 1. Long SID 2. Short OID 3. Compression
D 1, 2, and 3
The sharpness of image details depends on all the following except 1. quantity of filtration. 2. anode angle. 3. OIDs.
A 1 only
Which of the following devices converts electrical energy to mechanical energy? A Motor B Generator C Stator D Rotor
A Motor
Which of the x-ray circuit devices shown in Figure 6-5 operates on the principle of self-induction? A Number 1 B Number 3 C Number 5 D Number 7
A Number 1
Backscatter on a digital image can cause an artifact called a A Phantom image artifact B Moiré artifact C Static artifact D Grid cutoff artifact
A Phantom image artifact
Which of the following focal-spot sizes should be employed for magnification radiography? A 0.2 mm B 0.6 mm C 1.2 mm D 2.0 mm
A 0.2 mm
What pixel size has a 2,048 × 2,048 matrix with a 60-cm FOV? A 0.3 mm B 0.5 mm C 0.15 mm D 0.03 mm
A 0.3 mm
A star pattern is used to measure 1. focal spot resolution. 2. scatter resolution. 3. SID resolution.
A 1 only
Deposition of vaporized tungsten on the inner surface of the x-ray tube glass window 1. acts as additional filtration 2. results in increased tube output 3. results in anode pitting
A 1 only
Spatial resolution is directly related to 1. source-image distance (SID). 2. tube current. 3. focal spot size.
A 1 only
Which of the following examinations might require the use of 70 kV? 1. AP abdomen 2. Chest radiograph 3. Barium-filled stomach
A 1 only
Which of the following is (are) characteristic(s) of a 5:1 grid? 1. It allows some positioning latitude. 2. It is used with high-kilovoltage exposures. 3. It absorbs a high percentage of scattered radiation.
A 1 only
Which of the following is (are) directly related to photon energy? 1. Kilovoltage 2. Milliamperes 3. Wavelength
A 1 only
Which of the following is/are components of the secondary, or high voltage, side of the x-ray circuit? 1. Rectification system 2. Autotransformer 3. kV meter
A 1 only
Which of the following voltage ripples is (are) produced by single-phase equipment 1. 100% voltage ripple 2. 13% voltage ripple 3. 3.5% voltage ripple
A 1 only
Which of the following devices is used to overcome severe variation in patient anatomy or tissue density, providing more uniform radiographic density? A Compensating filter B Grid C Collimator D Protective filter
A Compensating filter
How would the introduction of a 6-in. OID affect analog image contrast? A Contrast would be increased. B Contrast would be decreased. C Contrast would not change. D The scale of contrast would not change.
A Contrast would be increased.
Quality control testing of digital display monitors should be conducted A Daily B Weekly C Monthly D Annually
A Daily
All of the following are potential digital pre-processing problems, except: A Edge enhancement B Defective pixel C Image lag D Line noise
A Edge enhancement
The safe approach to avoid an exposure field recognition error when using CR is to: A Expose one image on the smallest IP available with collimation margins aligned parallel to the edges of the IP B Expose multiple images on one IP, but make sure all collimation margins overlap C Expose one image on the IP, but do not collimate D Expose multiple images on one IP, but make sure all collimation margins are parallel to each other and do not overlap
A Expose one image on the smallest IP available with collimation margins aligned parallel to the edges of the IP
Which of the following techniques is used to evaluate the dynamics of a part? A Fluoroscopy B Stereoscopy C Tomography D Phototiming
A Fluoroscopy
Which of the following devices converts electrical energy to mechanical energy? A Motor B Generator C Stator D Rotor
A Motor
Pixel size and spacing determine the spatial resolution of the digital image. This is known as: A Pixel pitch B Focal resolution C Nyquist resolution D Frequency modulation
A Pixel pitch
The movement of the IP through the transport system of a CR reader is referred to as the: A Slow-scan direction B Charge-coupled direction C Nyquist direction D Fast-scan direction
A Slow-scan direction
The following are disadvantages of a capacitor-discharge mobile unit, except: A The mAs increases during the exposure, called "mAs creep" B The capacitor may continue to discharge after the exposure C The actual kilovoltage achieved during an exposure is significantly lower than the set kVp D At lower kVp settings, the capacitors discharge more slowly and, therefore, a considerable residual kV may exist after the desired exposure time
A The mAs increases during the exposure, called "mAs creep"
If a lateral projection of the chest is being performed on an asthenic patient and the outer photocells are selected, what is likely to be the outcome? A Underexposed image B Overexposed image C Scattered radiation fog D Motion blur
A Underexposed image
Digital fluoroscopy units use which of the following devices in lieu of a television camera tube? A charge-coupled device (CCD) B photometer C photomultiplier tube D light gate
A charge-coupled device (CCD)
If a radiograph, made using AEC, is overexposed because an exposure shorter than the minimum response time was required, the radiographer generally should A decrease the milliamperage B increase the milliamperage C increase the kilovoltage D decrease the kilovoltage
A decrease the milliamperage
A 15% decrease in kilovoltage accompanied by doubling the milliampere-seconds will result in a(n) A increase in patient dose B increase in exposure latitude C decrease in receptor exposure D decrease in spatial resolution
A increase in patient dose
The image intensifier's input phosphor differs from the output phosphor in that the input phosphor A is much larger than the output phosphor B emits electrons, whereas the output phosphor emits light photons C absorbs electrons, whereas the output phosphor absorbs light photons D is a fixed size, and the size of the output phosphor can vary
A is much larger than the output phosphor
X-ray energy is directly controlled by which of the following factors? A kVp B mAs C SID D OID
A kVp
Figure 4-19 is representative of A the anode heel effect B the line-focus principle C the inverse-square law D the reciprocity law
A the anode heel effect
Disadvantages of using lower kilovoltage technical factors, with mAs compensated to maintain receptor exposure, include 1. insufficient penetration 2. increased patient dose 3. diminished resolution
B 1 and 2 only
A device contained within many CR readers that functions to convert light energy released by the PSP into electrical energy, is called a: A Transilluminator B Photomultiplier tube C Light gate D Penetrometer
B Photomultiplier tube
One reason why only one image is preferred per image plate is: A To ensure that the anatomical part is properly centered to avoid undercutting of the image B To allow the radiologist to split the PACS monitor and display the current image and a prior image side-by-side for comparison C To ensure optimal radiation safety, since only one image is exposed on one image plate D To reduce the chances of grid cutoff artifacts
B To allow the radiologist to split the PACS monitor and display the current image and a prior image side-by-side for comparison
The part of a CT imaging system made of thousands of solid-state photodiodes is the A gantry. B detector array. C collimator assembly. D x-ray tube.
B detector array.
The type of x-ray tube designed to turn on and off rapidly, providing multiple short, precise exposures, is A high speed B grid-controlled C diode D electrode
B grid-controlled
A satisfactory radiograph of the abdomen was made at a 42-inch SID using 300 mA, 0.06-second exposure, and 80 kVp. If the distance is changed to 38 inches, what new exposure time would be required? A 0.02 second B 0.05 second C 0.12 second D 0.15 second
B 0.05 second
Advantages of battery-powered mobile x-ray units include their ability to store a large quantity of energy ability to store energy for extended periods of time lightweight quality
B 1 and 2 only
An analog x-ray exposure of a particular part is made and restricted to a 14 × 17 in. field size. The same exposure is repeated, but the x-ray beam is restricted to a 4 × 4 in. field. Compared with the first image, the second image will demonstrate 1. less receptor exposure 2. more contrast 3. more receptor exposure
B 1 and 2 only
Exposure rate increases with an increase in 1. mA. 2. kVp. 3. SID.
B 1 and 2 only
The advantages of capacitor-discharge mobile x-ray equipment include 1. compact size 2. light weight 3. high kilovoltage capability
B 1 and 2 only
The output phosphor can be coupled with the Vidicon TV camera or charge-coupled device (CCD) via 1. fiber optics. 2. an image distributor or lens. 3. closed-circuit TV.
B 1 and 2 only
Types of moving grid mechanisms include 1. oscillating. 2. reciprocating. 3. synchronous.
B 1 and 2 only
Which of the following methods can be used effectively to decrease differential absorption, providing a longer scale of contrast in the diagnostic range? 1. Using high peak kilovoltage and low milliampere-seconds factors 2. Using compensating filtration 3. Using factors that increase the photoelectric effect
B 1 and 2 only
Which of the following units is (are) used to express resolution? 1. Line-spread function 2. Line pairs per millimeter 3. Line-focus principle
B 1 and 2 only
Which of the following is (are) characteristic(s) of a 16:1 grid? 1. It absorbs more useful radiation than an 8:1 grid. 2. It has more centering latitude than an 8:1 grid. 3. It is used with higher-kilovoltage exposures than an 8:1 grid.
B 1 and 3 only
If the primary coil of the high-voltage transformer is supplied by 220 V and has 200 turns, and the secondary coil has 100,000 turns, what is the voltage induced in the secondary coil? A 40 kV B 110 kV C 40 V D 110 V
B 110 kV
If the distance from the focal spot to the center of the collimator's mirror is 6 in., what distance should the illuminator's light bulb be from the center of the mirror? A 3 in. B 6 in. C 9 in. D 12 in.
B 6 in.
A satisfactory radiograph was made using a 36-in. SID, 12 mAs, and a 12:1 grid. If the examination will be repeated at a distance of 42 in. and using a 5:1 grid, what should be the new milliampere-seconds value to maintain the original receptor exposure? A 5.6 B 6.5 C 9.7 D 13
B 6.5
In an AP abdomen taken at 105-cm SID during an IV urography series, one renal shadow measures 9 cm in width. If the OID is 18 cm, what is the actual width of the kidney? A 5 cm B 7.5 cm C 11 cm D 18 cm
B 7.5 cm
"Saturation" of an image in CR means that: A The CR reader has difficulty converting insufficient exposure signals to produce a diagnostic image; all electronic enhancement mechanisms are maximized B Beyond a certain exposure level, a large number of pixels will be at maximum digital value (black), resulting in loss of visibility of anatomical structures in that region. C There is a large amount of scatter radiation that is contributing to loss of anatomical image detail due to loss of contrast, thus decreasing diagnostic quality of the image D The CR image reader has adequately, and completely, read all the exposure intensities from the pixels resulting from the exposure
B Beyond a certain exposure level, a large number of pixels will be at maximum digital value (black), resulting in loss of visibility of anatomical structures in that region.
What type of x-ray imaging uses an area beam and a photostimulable phosphor as the IR? A Film radiography B Computed radiography C Digital radiography D Cineradiography
B Computed radiography
Histogram data that is skewed relative to the values of interest (VOI) of the histogram analysis used for a particular exam may be caused by all of the following, except: A Anatomical structures not centered to the IP B Excessive windowing C The X-ray beam is not correctly aligned to the edges of the IP D The beam edge is irregular because of overlap of a radiopaque shadow, such as a gonadal shield
B Excessive windowing
The radiographer must consider focal range when using which of the following accessory devices? A Collimator B Grid C Immobilization device D Lead marker
B Grid
Which of the following is most likely to produce a high-quality image? A Small image matrix B High signal-to-noise ratio (SNR) C Large pixel size D Low resolution
B High signal-to-noise ratio (SNR)
Before a flat-panel detector can be used for a radiographic exposure, it must be prepared. This preparation is referred to as: A Propagation B Initialization C Augmentation D Instrumentation
B Initialization
Which of the following requires two exposures to evaluate focal-spot accuracy? A Pinhole camera B Slit camera C Star pattern D Bar pattern
B Slit camera
OID is related to spatial resolution in which of the following ways? A Spatial resolution is directly related to OID. B Spatial resolution is inversely related to OID. C As OID increases, so does spatial resolution. D OID is unrelated to spatial resolution.
B Spatial resolution is inversely related to OID.
Consider a step-up transformer that increases the voltage induced on the secondary side of the transformer. What is the relationship of the primary side current to the secondary side current? A The secondary current is stepped up. B The secondary current is decreased. C There is no change in the current through the step-up transformer. D The secondary current is increased.
B The secondary current is decreased.
With milliamperage adjusted to produce equal exposures, all the following statements are true except A a single-phase examination done at 10 mAs can be duplicated with three-phase, 12-pulse at 5 mAs. B There is greater patient dose with three-phase equipment than with single-phase equipment. C Three-phase equipment can produce comparable radiographs with less heat unit (HU) buildup. D Three-phase equipment produces lower-contrast radiographs than single-phase equipment.
B There is greater patient dose with three-phase equipment than with single-phase equipment.
Which of the following is a type of television camera tube that converts a visible image on the output phosphor of the image intensifier into an electronic signal? A Ionization chamber B Vidicon C Charge-coupled device D Cathode ray tube
B Vidicon
Which of the following errors is illustrated in the figure below? A Patient not centered to IR B X-ray tube not centered to grid C Inaccurate collimation D Unilateral grid cutoff
B X-ray tube not centered to grid
All the following statements regarding mobile radiographic equipment are true except A the exposure cord must permit the operator to stand at least 6 ft from the patient, x-ray tube, and useful beam B exposure switches must be the two-stage type C a lead apron should be carried with the unit and worn by the radiographer during exposure D the radiographer must alert individuals in the area before making the exposure
B exposure switches must be the two-stage type
When involuntary motion must be considered, the exposure time may be cut in half if the kilovoltage is A doubled B increased by 15% C increased by 25% D increased by 35%
B increased by 15%
The x-ray tube is a DC electrical device, while the transformers that power it are AC devices. An arrangement of diodes between the two converts the AC voltage waveform into a pulsed DC output. The process of converting an electrical signal from AC into DC is called A electrification B rectification C amplification D ionization
B rectification
Continuous rotation of the CT x-ray tube and detector array, with simultaneous movement of the CT couch, has been accomplished through implementation of A additional cables. B slip rings. C multiple rows of detectors. D electron beam CT.
B slip rings.
Compensating filters are radiographically useful in that A they prevent unnecessary characteristic radiation from being produced. B they provide more uniform exposure to anatomical parts having unequal thicknesses. C they eliminate the need for internal and external filtration in the x-ray tube housing and collimator. D they eliminate scatter production in the patient, thereby reducing image noise.
B they provide more uniform exposure to anatomical parts having unequal thicknesses.
Focal-spot blur is greatest A toward the anode end of the x-ray beam B toward the cathode end of the x-ray beam C directly along the course of the CR D as the SID is increased
B toward the cathode end of the x-ray beam
An anatomical part calls for a kilovoltage (kVp) setting necessary to penetrate the part. If a lower than acceptable kVp were selected using a fixed milliampere-seconds (mAs) setting, this would result in which of the following? 1. Increased patient dose 2. Increased exposure to the image receptor 3. Decreased penetration of the anatomical part
C 1 and 3 only
Characteristics of an effective grid interspace material include 1. Low atomic number 2. Absorbs moisture 3. Radiolucent
C 1 and 3 only
If a radiograph exhibits insufficient receptor exposure, this might be attributed to 1. insufficient kV 2. insufficient SID. 3. grid cutoff.
C 1 and 3 only
The primary parts of the cathode include the 1. focal track. 2. filament. 3. focusing cup.
C 2 and 3 only
Which of the following may occur if the X-ray exposure field is not properly collimated, positioned, and sized? A Modulation transfer function failure B Moiré artifact C Exposure field recognition errors may occur D Ghost artifact
C Exposure field recognition errors may occur
All the following statements regarding CR IPs are true except A IPs have a thin lead foil backing. B IPs can be placed in the Bucky tray. C IPs must exclude all white light. D IPs function to protect the PSP.
C IPs must exclude all white light.
The image quality seen in the figure below is most likely the result of A an off-level grid B pronounced anode heel effect C low-milliampere-seconds and high-kilovoltage factors D low-kilovoltage and high-milliampere-seconds factors
C low-milliampere-seconds and high-kilovoltage factors
A grid is usually employed 1. when radiographing a large or dense body part. 2. when using high kilovoltage. 3. when less patient dose is required.
C 1 and 2 only
In comparison with 60 kV, 80 kV will 1.permit greater exposure latitude 2. produce more scattered radiation 3. produce shorter-scale contrast
C 1 and 2 only
Which of the following statements regarding dual x-ray absorptiometry is (are) true? 1. Radiation dose is low. 2. Only low-energy photons are used. 3. Photon attenuation by bone is calculated.
C 1 and 3 only
An exposure was made using 300 mA, 40 ms exposure, and 85 kV. Each of the following changes will cut the receptor exposure in half except a change to A 1/50 sec exposure B 72 kV C 10 mAs D 150 mA
C 10 mAs
In the radiographic rating charts shown below, what is the maximum safe kVp that may be used with the 1-mm focal spot, single-phase x-ray tube, using 300 mA and 1/50-second exposure? A 80 B 95 C 105 D 112
C 105
An exposure was made using 600 mA, 0.04 sec exposure, and 85 kVp. Each of the following changes will serve to reduce the receptor exposure by one-half except change to A 1/50 sec exposure B 72 kVp C 18 mAs D 300 mA
C 18 mAs
A decrease from 80 mAs to 40 mAs will result in a decrease in which of the following? 1. Wavelength 2. Exposure rate 3. Beam intensity
C 2 and 3 only
Spatial resolution can be improved by decreasing 1. the SID 2. the OID 3. patient/part motion
C 2 and 3 only
Use of a portion of the input phosphor during fluoroscopy, rather than the entire input phosphor, will result in 1. a larger field of view (FOV). 2. a magnified image. 3. improved spatial resolution.
C 2 and 3 only
Which of the following statements is (are) true regarding Figure 7-10? 1. Excessive kilovoltage was used. 2. High contrast is demonstrated. 3. Insufficient penetration is evident.
C 2 and 3 only
Both radiographic images seen in the figure below were made of the same subject using identical exposure factors. Which of the following statements correctly describes these images? 1. Image A illustrates less receptor exposure because a shorter SID was used. 2. Image A illustrates more receptor exposure because the subject was turned PA. 3. Image B illustrates more receptor exposure because a shorter SID was used.
C 3 only
If 82 kVp, 300 mA, and 0.05 second were used for a particular exposure using 3-phase, 12-pulse equipment, what mAs would be required, using single-phase equipment, to produce a similar radiograph? A 7.5 B 20 C 30 D 50
C 30
The luminescent light emitted by the PSP is converted to a digital image by the A DAC B scanner-reader C ADC D helium-neon laser
C ADC
Figure 7-5 illustrates which of the following? A Screen resolution test B Nine-penny test C Collimator accuracy test D Focal-spot size test
C Collimator accuracy test
Quality Control (QC) testing is used to evaluate digital display monitors in all of the following ways, except A Display luminance response B Display resolution C Display matrix size D Display noise
C Display matrix size
What does HIS stand for under hospital organizations? A Healthcare information system B Health information system C Hospital information system D Housing information system
C Hospital information system
For a radiographic exposure of the femur, how should the anode heel effect be properly applied? A Place the anode end of the x-ray tube over the proximal femur. B Place the cathode end of the x-ray tube over the distal femur. C Place the cathode end of the x-ray tube over the proximal femur. D Either the anode or cathode end of the x-ray tube could be placed over either end of the femur.
C Place the cathode end of the x-ray tube over the proximal femur.
Recently, dual-sided reading technology has become available in more modern CR readers, in which two sets of photodetectors are used to capture light released from the front and back sides of the phosphor storage plate, or PSP (photostimulable phosphor). This technology enables improved: A Slow-scan direction speed B Modulation transfer function C Signal-to-noise ratio D Fast-scan direction speed
C Signal-to-noise ratio
Which of the following digital post-processing methods remove high-frequency noise from the image? A Edge enhancement B Windowing C Smoothing D Aliasing
C Smoothing
What x-ray tube component does the number 6 in Figure 5-4 indicate? A Anode stem B Rotor C Stator D Focal track
C Stator
Which part of an induction motor is located outside the x-ray tube glass envelope? A Filament B Focusing cup C Stator D Rotor
C Stator
What is the function of the x-ray tube component numbered 2 in Figure 7-18? A To release electrons when heated B To release light when heated C To direct electrons to the focal track D To direct light to the focal track
C To direct electrons to the focal track
Changes between the images shown in the figures below represent changes made to A pixel size B matrix size C window width D window level
C window width
Acceptable method(s) of minimizing motion unsharpness is (are) 1. suspended respiration 2. short exposure time 3. patient instruction
D 1, 2, and 3
Acceptable method(s) of minimizing motion unsharpness is (are) 1. suspended respiration. 2. short exposure time. 3. patient instruction.
D 1, 2, and 3
Geometric unsharpness is influenced by 1. OID 2. SOD 3. SID
D 1, 2, and 3
Shape distortion is influenced by the relationship between the 1. x-ray tube and the part to be imaged. 2. body part to be imaged and the IR. 3. IR and the x-ray tube.
D 1, 2, and 3
When using the smaller field in a dual-field image intensifier, 1. a smaller patient area is viewed. 2. the image is magnified. 3. the image is less bright.
D 1, 2, and 3
Which of the following factors is/are related to grid efficiency? Grid ratio Number of lead strips per inch Amount of scatter transmitted through the grid
D 1, 2, and 3
Which of the following is not considered a radiographic geometric factor? A Magnification B Focal spot size C OID D Beam filtration
D Beam filtration
The optimal alignment of the anatomical part being imaged for all digital receptors should be: A Field centered to IP with at least two collimation margins and parallel to the IP edges B Centered anywhere on the IP, but having four distinct collimation margins, regardless of parallel orientation to the IP edges C Centered to the IP with at least one collimation margin aligned to nearest edge of IP D Field centered to IP with four collimation margins parallel to the IP edges
D Field centered to IP with four collimation margins parallel to the IP edges
What is the single most important factor controlling size distortion? A Tube, part, IR alignment B IR dimensions C SID D OID
D OID
What pixel size has a 2048 × 2048 matrix with an 80-cm FOV? A 0.04 mm B 0.08 mm C 0.2 mm D 0.4 mm
D 0.4 mm
Characteristics of DR imaging include 1. solid-state detector receptor plates 2. a direct-capture imaging system 3. immediate image display
D 1, 2, and 3
Which of the following is (are) characteristic(s) of a 16:1 grid? 1. It absorbs a high percentage of scattered radiation. 2. It has little positioning latitude. 3. It is used with high-kVp exposures.
D 1, 2, and 3
Which of the following is (are) tested as part of a QC program? 1. Beam alignment 2. Reproducibility 3. Linearity
D 1, 2, and 3
Which of the following pathologic conditions are considered additive conditions with respect to selection of exposure factors? 1. Osteoma 2. Bronchiectasis 3. Pneumonia
D 1, 2, and 3
Using a multifield image intensifier tube, which of the following input phosphor diameters will provide the greatest magnification? A 35 cm B 25 cm C 17 cm D 12 cm
D 12 cm
In order to avoid background radiation artifacts when using CR, it is important to: A Erase all image plates that have not been used for 48 hours B Erase all image plates if there is any question about how long it has been since the plate has been erased C Erase an image plate if there is any doubt as to when it was last erased, especially in the case of pediatric radiography D All of these are correct actions
D All of these are correct actions
Sampling frequency in computed radiography (CR) is expressed as: A The TFT array size B An inverse relationship between focal spot size and matrix size C The distance between the image plate and the light guide D Pixels/mm or pixel density
D Pixels/mm or pixel density
The electron beam in a television cathode ray tube (CRT) is projected onto the output phosphor in a: A Vertical pattern B Fixed direct beam C Broad field D Raster pattern
D Raster pattern
What is the purpose of the aluminum layer in a CR (photostimuable phosphor) cassette? A The aluminum layer is used to filter low energy x-rays in the primary beam, saving patient dose. B The aluminum layer reflects blue light toward the photomultiplier tube during image processing. C The aluminum layer traps the electrons, which are later released via stimulation with red laser light. D The aluminum layer absorbs backscatter radiation, preserving the signal-to-noise ratio for the image.
D The aluminum layer absorbs backscatter radiation, preserving the signal-to-noise ratio for the image.
Geometric unsharpness is most likely to be greater A at long SIDs. B at the anode end of the image. C with small focal spots. D at the cathode end of the image.
D at the cathode end of the image
A radiograph made with a parallel grid demonstrates decreased receptor exposure on its lateral edges. This is most likely due to A static electrical discharge B the grid being off-centered C improper tube angle D decreased SID
D decreased SID
All the following have an impact on radiographic contrast except A photon energy B grid ratio C OID D focal-spot size
D focal-spot size
Which combination of exposure factors most likely will contribute to producing the shortest-scale contrast? A mAs: 10; kV: 70; Grid ratio: 5:1; Field size: 14 × 17 in. B mAs: 12; kV: 90; Grid ratio: 8:1; Field size: 14 × 17 in. C mAs: 15; kV: 90; Grid ratio: 12:1; Field size: 11 × 14 in. D mAs: 20; kV: 80; Grid ratio: 10:1; Field size: 8 × 10 in.
D mAs: 20; kV: 80; Grid ratio: 10:1; Field size: 8 × 10 in
Biomedical repair technicians often perform repairs of diagnostic imaging equipment without a complaint of malfunction, but rather to test and replace parts of the machine known to experience wear and tear with normal operation. These types of repairs are called A acceptance testing. B quality assurance repairs. C service call repairs. D preventive maintenance.
D preventive maintenance.
