Chapter 29- Computed Tomography Questions
With Accurate Answers
+210 degree arc; cardiac correct answer the detector rings on the 5th generation
scanners are in a ___ and are primarily used for ___ studies
0 correct answer water= __ HU
0.5% correct answer tissue density differences of less than __ can be
distinguished by CT
1-3; 3-5 minutes; hold still correct answer with first generation scanners,
depending on the manufacturer, ___ (how many?) detectors were placed
opposite the tube for radiation detection. Scan time was usually ___ minutes per
scan, which required the pt to __ __ for extended periods of time which became a
problem when imaging a body part other than the brain
1. gantry
2. computer and operator console
3. patient table correct answer what are the 3 major components of a CT
scanner?
1. head
2. chest
3. abdomen correct answer what are the 3 most commonly requested CT
procedures?
1. intravenously
,2. orally
3. rectally correct answer by what 3 routes is contrast introduced for CT
procedures?
1. less invasive ----doesnt require arterial puncture
2. post processing capable of eliminating overlying structures so that only the
vascular anatomy is reconstructed
3. any image made with CT can be reconstructed without additional radiation
exposure or IV contrast administration correct answer list 3 advantages of CT
angiography over conventional angiography
1. slice thickness
2. scan time
3. scan diameter
4. pt instruction correct answer what are 4 image quality factors that are under
the technologist's control?
1. spatial resolution
2. contrast resolution
3. noise
4. artifacts correct answer what are the 4 main factors that affect CT image
quality?
10; motion correct answer scan times were decreased by up to __ seconds/slice
with third generation, which helped decrease ___ artifacts
, 20 correct answer the second generation scanners improved overall image quality
and decreased scan time to about __ for a single slice however the time to
complete a single scan still remained long
3 mm correct answer typical scan slice thickness for a cervical spine CT?
3D imaging correct answer a post-processing technique that is applied to the raw
data to create realistic images of the surface anatomy that is to be visualized
3rd correct answer current PET/CT scanners are __ generation and incorporate
the latest in detector technology
3rd; 4-320 correct answer most scanners today are ____ generation variation that
have __ to __ rows of detectors in a single array
4th correct answer __ generation scanners tended to yield a higher patient dose
per scan than previous generations of CT scanners
5 mm correct answer typical scan slice thickness for a CT scan of the abdomen?
5 mm correct answer typical slice thickness for a basic head CT?
6th generation correct answer these scanners are dual energy sourced and have 2
sets of detectors that are offset by by 90 degrees
a. artifacts correct answer reconstruction algorithm affects all of the image quality
factors except for?
With Accurate Answers
+210 degree arc; cardiac correct answer the detector rings on the 5th generation
scanners are in a ___ and are primarily used for ___ studies
0 correct answer water= __ HU
0.5% correct answer tissue density differences of less than __ can be
distinguished by CT
1-3; 3-5 minutes; hold still correct answer with first generation scanners,
depending on the manufacturer, ___ (how many?) detectors were placed
opposite the tube for radiation detection. Scan time was usually ___ minutes per
scan, which required the pt to __ __ for extended periods of time which became a
problem when imaging a body part other than the brain
1. gantry
2. computer and operator console
3. patient table correct answer what are the 3 major components of a CT
scanner?
1. head
2. chest
3. abdomen correct answer what are the 3 most commonly requested CT
procedures?
1. intravenously
,2. orally
3. rectally correct answer by what 3 routes is contrast introduced for CT
procedures?
1. less invasive ----doesnt require arterial puncture
2. post processing capable of eliminating overlying structures so that only the
vascular anatomy is reconstructed
3. any image made with CT can be reconstructed without additional radiation
exposure or IV contrast administration correct answer list 3 advantages of CT
angiography over conventional angiography
1. slice thickness
2. scan time
3. scan diameter
4. pt instruction correct answer what are 4 image quality factors that are under
the technologist's control?
1. spatial resolution
2. contrast resolution
3. noise
4. artifacts correct answer what are the 4 main factors that affect CT image
quality?
10; motion correct answer scan times were decreased by up to __ seconds/slice
with third generation, which helped decrease ___ artifacts
, 20 correct answer the second generation scanners improved overall image quality
and decreased scan time to about __ for a single slice however the time to
complete a single scan still remained long
3 mm correct answer typical scan slice thickness for a cervical spine CT?
3D imaging correct answer a post-processing technique that is applied to the raw
data to create realistic images of the surface anatomy that is to be visualized
3rd correct answer current PET/CT scanners are __ generation and incorporate
the latest in detector technology
3rd; 4-320 correct answer most scanners today are ____ generation variation that
have __ to __ rows of detectors in a single array
4th correct answer __ generation scanners tended to yield a higher patient dose
per scan than previous generations of CT scanners
5 mm correct answer typical scan slice thickness for a CT scan of the abdomen?
5 mm correct answer typical slice thickness for a basic head CT?
6th generation correct answer these scanners are dual energy sourced and have 2
sets of detectors that are offset by by 90 degrees
a. artifacts correct answer reconstruction algorithm affects all of the image quality
factors except for?
