UPDATED RTE 1401 FINAL TEST EXAM
WITH ANSWERS 2025-2026
Tube failure reasons - answer-1. Single high-
heat exposure on cold anode
2. Tungsten vaporizing
3. Consecutive high heat exposures or long
exposure times
Heat Units (HU) - answer-kVp × ma × sec. ×
rectification constant (RC)
Fixed mAs/ variable kVp chart - answer-adjust
kVp by multiplying by 2 (+/-) for every
increment of ONE centimeter or inch of size
difference
,Fixed KVP/ variable mAs chart - answer-
adjust mAs by multiplying (+) by 2 for every
4-5 centimeter or inch size difference
digital image quality factors - answer-
brightness, contrast resolution, spatial
resolution, distortion exposure indicator,
noise
brightness - answer-intensity of light coming
through monitor
contrast resolution - answer-how well a
system can display varying shades of gray
-affected by dynamic range
,pixel depth - answer-determines the number
of shades of gray that can be displayed: 2 to
the 14th power= 16,384 shades of gray
spatial resolution - answer-measured in Lp/
mm
-2.5- 5 Lp/mm in digital imaging
distortion - answer-size & shape
effected by SID, OID, and alignment
exposure indicator - answer-number displayed
on the processed image to indicate the level of
x-ray exposure received to the digital image
receptor.
-red, yellow or green
, noise - answer-random disturbance that
reduces of obscures image clarity
-SNR and quantum noise
Signal to Noise Ratio (SNR) - answer-The
ratio of the speech signal (intended signal) to
that of the background noise
-HIGH is ALWAYS best
quantum noise - answer-lack of sufficient data
(photons) - results in blotchy or mottled
image. Increase mAs to fix
algorithms - answer-complex math equations
used to maintain image quality
WITH ANSWERS 2025-2026
Tube failure reasons - answer-1. Single high-
heat exposure on cold anode
2. Tungsten vaporizing
3. Consecutive high heat exposures or long
exposure times
Heat Units (HU) - answer-kVp × ma × sec. ×
rectification constant (RC)
Fixed mAs/ variable kVp chart - answer-adjust
kVp by multiplying by 2 (+/-) for every
increment of ONE centimeter or inch of size
difference
,Fixed KVP/ variable mAs chart - answer-
adjust mAs by multiplying (+) by 2 for every
4-5 centimeter or inch size difference
digital image quality factors - answer-
brightness, contrast resolution, spatial
resolution, distortion exposure indicator,
noise
brightness - answer-intensity of light coming
through monitor
contrast resolution - answer-how well a
system can display varying shades of gray
-affected by dynamic range
,pixel depth - answer-determines the number
of shades of gray that can be displayed: 2 to
the 14th power= 16,384 shades of gray
spatial resolution - answer-measured in Lp/
mm
-2.5- 5 Lp/mm in digital imaging
distortion - answer-size & shape
effected by SID, OID, and alignment
exposure indicator - answer-number displayed
on the processed image to indicate the level of
x-ray exposure received to the digital image
receptor.
-red, yellow or green
, noise - answer-random disturbance that
reduces of obscures image clarity
-SNR and quantum noise
Signal to Noise Ratio (SNR) - answer-The
ratio of the speech signal (intended signal) to
that of the background noise
-HIGH is ALWAYS best
quantum noise - answer-lack of sufficient data
(photons) - results in blotchy or mottled
image. Increase mAs to fix
algorithms - answer-complex math equations
used to maintain image quality
