Chp 04 Quiz

Alison pg. 102 Edge enhancement is also known as _________________ A) quantum noise B) high pass filter C) low pass filter

B

Alison pg. 85 An image receptor with higher DQE requires ______________ X-ray exposure to produce a quality image A) more B) less C) equal

B

Brandon pg. 99 A wider window width ____? A. image has higher contrast B. image has lower contrast

B

Kyle ___ is the different number of shades of gray. A. brightness B. window width C. gray scale D. smoothness

C

Jacob pg. 72 Which of the following is considered the largest? a) Byte b) Word c) Bit

b

Alison pg. 76 Most energy from the exit radiation intensities are stored in the _______________ A) PSP B) Cathode C) Anode

A

Angelo Pg An image receptor with a ___ DQE requires less xray exposure to produce a quality image compared to a ___ DQE value. a. high; low b. low; high c. low; none

A

Angelo Pg The CR latent image is acquired in the PSP layer of the IP. a. True b. False

A

Cassie pg. 84 Digital imaging systems have a wide dynamic range. A) True B) False

A

Elizabeth pg. 75 __________ is the emission of light when stimulated by radiation. A. Luminescence B. Photostimulable phosphor C. Photostimulable luminescence D. Modulation transfer function

A

Elizabeth pg. 85 Signal-to-noise ratio is a method of describing the strength of the radiation exposure compared with the amount of noise apparent in a digital image. A. True B. False

A

Gabby (pg 70) The pixel size is directly related to FOV and inversely related to matrix size. A. True B. False

A

Gwen Digital systems have a wide dynamic range. A. True B. False

A

Gwen Which of the following is used to extract a latent image from an imaging plate? A. a laser beam B. photomultiplier tube C. analog-to-digital converter D. thin-film transistor

A

Hieu Pg 68 What is stored as digital data and must be processed by a computer for viewing on a display monitor? A. Latent image B. Pixel image C. matrix image

A

Hieu Pg 72 What is defined by the unit of line pairs per millimeter (lp/mm)? A. Spatial frequency B. Grid ratio C. Frequency

A

Hieu Pg 90 What provides a method of altering the image to change the display of the digital image in various ways? A. Lookup tables B. Roundup tables C. Look down tables

A

Jin The dynamic range of digital imaging system refers to the ability of a detector to accurately capture the range of photons that exits the patient A) True B) False

A

Kelsey What measures the imaging systems ability to accurately display small anatomic objects having high special frequency? A) MTF B) Imaging plate C) None of the above

A

Marissa Pixel size is directly related to FOVAnd inversely related to matrix size A. True B. False

A

Nusrat p. 102 The post processing function where underexposed areas are made darker and over exposed areas are made lighter is called A. Equalization B. Smoothing C. Inversion D. Edge Enhancement

A

Tammy Pg 95 What kind of lighting is best used for monitor placement? A. Ambient B. Bright C. Dark

A

Brandon pg 71 If a pixel has a bit depth of 14 how many shades of gray can that pixel display? A. 4096 B. 16,384 C. 65,536

B

Brandon pg. 85 Signal-to-noise ratio(SNR) is a measurement of efficiency of an image receptor in converting the x-ray exposure it receives to a quality radiographic image. A. True B. False

B

Cassie pg. 105 What is the communication standard for information sharing between PACS and imaging modalities? A. DQE B. DICOM C. SMPTE D. HL7

B

Elizabeth pg.99 _________ is a control that adjusts the radiographic contrast. A. Grayscale B Window width C. Contrast resolution D. Window level

B

Gabby (pg 86) ____ refers to various computer manipulations applied to digital images for the purpose of optimizing their appearance? A. Quantum noise B. Digital imaging processing C. Pixel D. All of the above

B

Haley A lower signal-to-noise ratio improves the quality of a digital image. A. True B. False

B

Holly (p 76) The CR latent image is acquired in the ____ layer of the imaging plate A. Protective B. Photostimulable phosphor C. Base

B

Holly (p 82) Indirect conversion detectors use a scintillator to: A. Convert exit radiation to electrical charges B. Convert exit radiation to visible light C. Convert electrical charges to visible light

B

Jin Which of the following would increase digital image quality? A) Small matrix & large pixel size B) Large matrix & increased pixel density C) Large matrix & large pixel size D) Non of the above

B

Julio PG 79-80 In a fixed matrix size CR system using a Larger IP results in improved spatial resolution. A. True B. False

B

Julio PG 94-95 What type of monitor passes light through crystals to create an image? A. CRT B. LED C. Plasma D. AEC

B

Kelsey pg 71 What determines the amount of precision in digitizing the analog signal and therefore the number of shades of gray that can be displayed in the image? A) pixel size B) bit depth C) none of the above

B

Kyle ___ is improved by increasing pixel density and decreases pixel pitch. A. frequency B. spacial resolution C. exposure index D. all of the above

B

Phuong Pg 69 Increasing the field of view for a fixed matrix size will increase the pixel size. Thus, increasing image quality. a true b. false

B

Phuong Pg 70 Which of these facts would improve spatial resolution? a. increase pixel size b. increase matrix size c. increase field of view

B

Sam Pg 72 T/F Increasing pixel density and decreasing pixel pitch decreases spatial resolution. A) True B) False

B

Sam Pg 79 Regarding a fixed matrix size CR system: Using a _________ IP for a given FOV results in improved spatial resolution of the digital image. A. Bigger B. Smaller C. Does not matter

B

Tammy Pg 94 ___ are high quality monitors used for diagnostic interpretation. A. LCD B. Primary C. CRT

B

Tammy Pg 99 When using wide window width, the image will have high contrast. A. True B. False

B

Angelo Pg 72 ___ pixel density and ___ pixel pitch ___ spacial resolution. a. Increasing; decreasing; decreasing b. Decreasing; increasing; decreasing c. Increasing; decreasing; increasing d. Decreasing; increasing; increasing

C

Cassie pg. 75/76 The type of image receptor that uses photostimulable phosphor to acquire the latent image is- A. An intensifying screen B. Flat panel detector C. Computed radiography D. Radiographic film

C

Gabby (pg 70) The smallest component of the matrix is? A. Matrix Size B. Brightness C. Pixel D. None of the above

C

Gwen Which of the following is defined as a graphic representation of the pixel values? A. automatic rescaling B. values of interest C. histogram D. exposure indicator

C

Holly (p 74) Modulation transfer function (difference in brightness levels) will range from: A. 0 to 10 B. 0 to 5 C. 0 to 1

C

Jin IR that uses photostimulable phosphor to acquire the latent image is __________. A) Intensifying screen B) Flat-panel detector C) Computed radiography D) Radiographic film

C

Julio PG 68-70 To increase spatial resolution in digital imaging which of the following would be reasonable? A. Increase FOV and keep matrix size the same B. Increase pixel size C. Increase matrix size and keep FOV the same

C

Kelsey The type of image receptor that uses a photostimulable phosphor to acquire the latent image is...? A) an intensifying screen B) a flat panel detector C) computed radiography D) radiographic film

C

Nusrat p. 72 What happens when pixel density increases A. Pixel pitch decreases B. Spacial resolution increases C. Both A and B D. Neither A and B

C

Haley A wider window width ___. A. increases brightness B. decreases brightness C. increases contrast D. decreases contrast

D

Haley Display monitors used for soft-copy viewing of digital images should have ___. A. increased ambient lighting B. decreased matrix size C. low spatial resolution D. high luminance

D

Kyle ___ is a postprocessing technique that reverses gray scale. A. smoothing B. equalization C. subtraction D. inversion

D

Nusrat p. 68 The size of a pixel is measured in A. Amps B. Centimeters C. Volts D. Microns

D

Sam What increases as matrix size increases? A. Computer processing B. Network transmission C. Digital storage space D. All of the above

D

(Marco) Pg 86 _________ ratio is a method of describing the contrast resolution compared to the amount of noise apparent in a digital image. a. Contrast to noise ratio b. Quantum noise discrepancy c. Signal to noise ratio

a

Aleyda pg. 70 A pixel is the smallest component of the matrix. a) true b) false

a

Jacob pg. 71 Greater pixel bit depth will display ___ shades of gray on the image a) More b) Less c) No

a

Marissa Increasing the matrix size for the same FOV will ______ the pixel size and increase special resolution a. decrease b. Increase c. Maintain

a

Marissa The greater the bit depth the more _______ the Digitization of the analog signal a. percise b. off c. maintain

a

(Marco) Pg 90 ______ provide the means to alter the original pixel values to improve the brightness and contrast of the image. a. EXI b. Lookup tables c. Film evaluation

b

Aleyda pg. 75 Luminescence is the emission of _______ when stimulated by radiation. a) heat b) light c) energy

b

Aleyda pg. 99 An indirect relationship exists between window level & image brightness on the display monitor. a) true b) false

b

Jacob pg. 84 Digital IRs have a ___ dynamic range. a) Long b) Wide c) Small

b

Phuong Pg 69 Matrix size of 1024x1024 and matrix size 2048 x 2048 which of these matrix sizes will have the smallest pixel? a. 1024 x 1024 b. 2048 x 2048

b

(Marco) Pg 85 ________ is a method of describing the strength of radiation exposure compared with the amount of noise apparent in a digital image. a. Contrast to noise ratio b. Quantum noise discrepancy c. Signal to noise ratio

c