LRA 221 ACTUAL EXAM PAPER 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ the ability of an imaging system to display subtle changes in shades of gray
is called.
Answer: contrast resolution
◍ A Bucky apparatus is required for D
R. T/F.
Answer: false
◍ The number of bits per pixel is known as bit.
Answer: depth
◍ Technologist efficiency ratings are generally the same when comparing
conventional radiography with ______ radiography
A. computed
B. digital.
Answer: computed
◍ Image level parameters control image ______.a. Brightnessb. Darknessc.
Contrastd. Density.
Answer: contrast
◍ Failure of the reader to find the collimation edges of an image.
Answer: will result in image cut off
◍ Low kVp Histogram Effect.
Answer: Shifts histogram toward lighter tones, higher contrast - "Low kVp =
light + sharp contrast."
◍ Look-Up Table (LUT).
Answer: A mapping function that uses a histogram of luminance
(brightness) values collected during image acquisition to assign display gray
, levels | Used in digital radiography post-processing to adjust contrast and
brightness | Memory Trick: "LUT = Light Up Tones" → It looks at the
brightness histogram and remaps tones so the image looks right
◍ Window width controls the ratio of black and white, also known as
A. window
B. level
C. contrast
D. matrix.
Answer: contrast
◍ It is possible to achieve an MTF of 100%. T/F.
Answer: false
◍ Noise (Quantum Mottle).
Answer: Random variation in pixel values that reduces image quality -
"Noise = static."
◍ similar to CR, DR can use the existing diagnostic equipment found in
today's imaging departments.
Answer: false
◍ PSP imaging plates are erased by flooding the plate with:
A. light.
B. radiation.
C. electrons.
D. phosphors..
Answer: light
◍ A histogram displays the useful signal by locating:a. all pixel values.b.
maximum and minimum signal.c. maximum signal only.d. minimum signal
only..
Answer: max. and min. signal
◍ The shape of the histogram is anatomy specific
A. True
B. False.
, Answer: true
◍ Exposure latitude is to conventional radiography as _______ is to D
R. a. Characteristic responseb. Linear mannerc. Subject contrastd. Dynamic
range.
Answer: dynamic range
◍ The range of exposure values the image detector is able to produce is known
as:a. dynamic range.b. modulation transfer.c. latitude.d. detective quantum
efficiency..
Answer: latitude
◍ Demographic Input Accuracy.
Answer: Correct patient data entry; legally and medically critical - "Wrong
name = big blame."
◍ in reference to PSP image capture, to release the latent image, which of the
following devices is scanned over the phosphor plate.
Answer: focused laser light
◍ Excessive light entering the eye when viewing an image is known as ______
glare.a. Veilb. Windowc. Leveld. None of these.
Answer: veil glare
◍ The process of joining two or more images into one continuous image is
known as image ______.a. Connectionb. Annotationc. Stitchingd. Lacing.
Answer: stitching
◍ The reflective layer:
A. absorbs and reduces static.
B. gives the imaging sheet strength.
C. protects the back of the cassette.
D. sends light in a forward direction..
Answer: D. sends light in a forward direction.
◍ the two elements needed to convert light signals into an electrical signal
while using indirect capture DR are TFT and.
QUESTIONS WITH ANSWERS GRADED A+
◍ the ability of an imaging system to display subtle changes in shades of gray
is called.
Answer: contrast resolution
◍ A Bucky apparatus is required for D
R. T/F.
Answer: false
◍ The number of bits per pixel is known as bit.
Answer: depth
◍ Technologist efficiency ratings are generally the same when comparing
conventional radiography with ______ radiography
A. computed
B. digital.
Answer: computed
◍ Image level parameters control image ______.a. Brightnessb. Darknessc.
Contrastd. Density.
Answer: contrast
◍ Failure of the reader to find the collimation edges of an image.
Answer: will result in image cut off
◍ Low kVp Histogram Effect.
Answer: Shifts histogram toward lighter tones, higher contrast - "Low kVp =
light + sharp contrast."
◍ Look-Up Table (LUT).
Answer: A mapping function that uses a histogram of luminance
(brightness) values collected during image acquisition to assign display gray
, levels | Used in digital radiography post-processing to adjust contrast and
brightness | Memory Trick: "LUT = Light Up Tones" → It looks at the
brightness histogram and remaps tones so the image looks right
◍ Window width controls the ratio of black and white, also known as
A. window
B. level
C. contrast
D. matrix.
Answer: contrast
◍ It is possible to achieve an MTF of 100%. T/F.
Answer: false
◍ Noise (Quantum Mottle).
Answer: Random variation in pixel values that reduces image quality -
"Noise = static."
◍ similar to CR, DR can use the existing diagnostic equipment found in
today's imaging departments.
Answer: false
◍ PSP imaging plates are erased by flooding the plate with:
A. light.
B. radiation.
C. electrons.
D. phosphors..
Answer: light
◍ A histogram displays the useful signal by locating:a. all pixel values.b.
maximum and minimum signal.c. maximum signal only.d. minimum signal
only..
Answer: max. and min. signal
◍ The shape of the histogram is anatomy specific
A. True
B. False.
, Answer: true
◍ Exposure latitude is to conventional radiography as _______ is to D
R. a. Characteristic responseb. Linear mannerc. Subject contrastd. Dynamic
range.
Answer: dynamic range
◍ The range of exposure values the image detector is able to produce is known
as:a. dynamic range.b. modulation transfer.c. latitude.d. detective quantum
efficiency..
Answer: latitude
◍ Demographic Input Accuracy.
Answer: Correct patient data entry; legally and medically critical - "Wrong
name = big blame."
◍ in reference to PSP image capture, to release the latent image, which of the
following devices is scanned over the phosphor plate.
Answer: focused laser light
◍ Excessive light entering the eye when viewing an image is known as ______
glare.a. Veilb. Windowc. Leveld. None of these.
Answer: veil glare
◍ The process of joining two or more images into one continuous image is
known as image ______.a. Connectionb. Annotationc. Stitchingd. Lacing.
Answer: stitching
◍ The reflective layer:
A. absorbs and reduces static.
B. gives the imaging sheet strength.
C. protects the back of the cassette.
D. sends light in a forward direction..
Answer: D. sends light in a forward direction.
◍ the two elements needed to convert light signals into an electrical signal
while using indirect capture DR are TFT and.
