Radiology Test Review 10, 19

A good reason for sometimes selecting the highest available mA station to obtain a given amount of mAs is to: keep the exposure time as short as possible use the small focal spot prevent excessive anode heat accommodate breathing technique

a

A listing of the various radiographic examinations performed in a radiographic room along with the exposure factors is called a(n): technique chart exposure index tube rating chart caliper chart

a

If there is too much density on a radiograph, how can it be corrected? reduce mAs by at least 50% add a radiographic marker correct rotation of anatomy reduce kVp by at least 50%

a

What is the correct exposure time required to produce 50 mAs when using the 200 mA station? 0.25 s 4 s 2.5 s 0.4 s

a

What is the first step in a systematic image review? check for accurate and complete image identification markers check for pertinent and complete anatomy in the proper position check for appropriate density and contrast check for aesthetic quality

a

When an image is too light, what is usually the best technique adjustment for the repeat radiograph? increase mAs 100% decrease mAs 50% increase kVp 100% decrease kVp 50%

a

Which of the following body parts can benefit from the use of a compensating filter? AP thoracic spine AP cervical Spine AP skull AP abdoment

a

Which of the following would cause a radiograph to have too much contrast? kVp level set too low kVp level set too high mA station too low mA station too high

a

A decrease in exposure technique would be required if a patient had: cardiomegaly degenerative arthritis pleural effusion rheumatoid arthritis

b

How does one determine if the mA station is obtainable at the desired kVp without exceeding the capacity of the x-ray tube? consult the technique chart consult the tube rating chart consult the generator maximum ratings consult the equipment manufacturer's engineer

b

If the kVp is increased using the 15% rule, an 80 kVp exposure would change to which of the following? 68 kVp 92 kVp 105 kVp 160 kVp

b

Most experienced limited operators have a repeat rate of about: 1% 4% 10% 15%

b

Technique charts are based on patient-body part measurements obtained using an x-ray caliper. These measurements are expressed as: circumference in inches part thickness in centimeters diameter in centimeters part thickness and width in inches

b

What is an advantage of the variable kVp technique chart? it is easier to calculate the overall image contrast is lower, which can provide greater visibility of detail it prompts less patient exposure on most examinations it produces fewer heat units per exposure

b

What is the name of the organization that requires technique charts to be posted for every radiographic room? State Department of Health The Joint Commission ASRT ARRT

b

What is the proper method to hang an AP projection of the foot? with the toes pointing toward the floor with the toes pointing toward the ceiling with the toes pointing toward the right with the toes pointing toward the left

b

What is the single most important technical exposure adjustment that should be made when imaging an obese patient? decreasing the kVp increasing the kVp decreasing the mAs increasing the mAs

b

Which category of patient seldom requires a compensating filter for general radiographic examinations? geriatric pediatric age 18 to 24 age 30 to 40

b

Which of the following approaches to technique charts will provide the highest kVp setting, the lowest patient dose, and the greatest exposure latitude? high kVp optimum kVp medium kVp low kVp

b

Which radiographic quality characteristic is primarily affected by kVp? density contrast spatial resolution distortion

b

Which type of technique chart has a specific mAs value for each projection and uses small changes in kVp to compensate for variances in patient or part size? fixed kVp variable kVp fixed SID variable SID

b

A decrease in exposure technique would be required if a patient had: ascites pneumonia bowel obstruction acromegaly

c

A satisfactory radiograph is made using 20 mAs at 40 inches SID. How much mAs is needed to produce a similar radiograph at 60 inches SID? 30 mAs 35 mAs 45 mAs 55 mAs

c

How much of a change in mAs is needed if there is a 2-cm increase in part size? 20% 25% 30% 40%

c

Radiographs made with the patient in the ______ position are usually hung horizontally. supine prone decubitis upright

c

Technique charts are based on: patient wt and body habitus processor temperature and replenishment rates thickness of body part to be radiographed nature of the suspected pathologic condition

c

What causes an unexposed area at the top or bottom of a radiographic image? scatter radiation patient not aligned to the IR CR not aligned to the IR CR not centered to anatomy of interest

c

What is a radiographic phantom? an unwanted density on an x-ray image another name for an artifact a human skeleton or part of a skeleton encased in plastic to simulate human tissue a tool for measuring body parts to set exposure factors

c

What is the major limitation in obtaining images of obese patients? a strong enough table to hold the patient reduced resolution due to motion inadequate penetration of the body part inability to adjust the mAs high enough

c

Which of the following are types of technique charts? variable mAs and fixed mAs variable mAs and fixed kVp variable kVp and fixed kVp variable kVpand fixed mAs

c

Which of the following statements about right and left side markers is not recommended? the marker should be clearly visible all markers should be placed so they are recorded on the image during exposure electronic markers should be added during image review and postprocessing the marker should be properly located

c

Which of the following will decrease patient motion in the radiograph? use of low MA techniques use of low kVp techniques using clear instructions selection of a slow-speed screen if motion is anticipated

c

Which of the following would be a factor used to evaluate radiation safety? contrast density collimation patient positioning

c

Which technical factor should be used to correct problems with radiographic density? SID grid ratio mAs kVp

c

A good reason for selecting a low mA station to obtain a given amount of mAs is to: reduce motion blur obtain optimum kVp maintain the SID at 40 inches use the small focal spot

d

An increase in exposure technique would be required if a patient had: advanced age pneumothorax osteoporosis cardiomegaly

d

The minimum amount of mAs change that will prompt a visible change in image density is: 5% 10% 20% 30%

d

Using the principle of optimum kilovoltage to formulate exposure techniques will result _______ patient exposure and _______ exposure latitude. high, narrow high, great the least, narrow the least, wide

d

What is a most common cause of magnification distortion and poor definition? low mA, high kVp techniques high mA, low kVp techniques long SID long OID

d

Which of the following describes optimum radiographic viewing conditions? radiographs should be viewed with a hot light radiographs should be viewed in a totally darkened room radiographs should be viewed in a normally lit room radiographs should be viewed in a room with low light

d

Which of the following may be a cause of technique chart failure? incorrect mA station selection excessive exposure time insufficient exposure time kVp level not optimum to penetrate the part

d

Which of the following statements regarding technique charts is true? Technique charts are: the same for every rad depts the same for every x-ray machine within a rad dept the same regardless of IR, grid, SID and other factors unique to each x-ray machine and each facility

d

Which technical factor is used to alter radiographic contrast? mA exposure time SID kVp

d