Chapter 25- Computed Tomography Questions
with Accurate Answers
when and who first had a successful demonstration of a CT correct answer 1970
by Godfrey Hounsfield and Allan Cormack
what were the first units dedicated for correct answer head scans
what is CT correct answer the process of creating cross-sectional tomographic
plan of any part around the body
how is each image demonstrated correct answer cross-sectional format
ray correct answer x-ray beam path through the subject corresponding to each
measurement
view correct answer set of measurements made during the translation and their
associated rays
translation correct answer linear transverse scanning motion of the tube and the
detector across the subject
what are CT's benefits correct answer no superimposition, improved contrast
resolution (reduced scatter), and has image manipulation and enhancement
techniques
raw data correct answer measured x-ray transmission values
, signal strength correct answer value of each number is directly proportional to
matrix correct answer a grid of rows and columns
pixel correct answer single square, or picture element, within a matrix
volume and dimension correct answer slice thickness adds
voxel correct answer volume element of matrix; product of pixel area and slice
thickness
0
-1000
+1000 correct answer CT numbers for water, air, and bone
computer correct answer links technologist and other components of imaging
system
four functions: 1. control data acquisition 2. image reconstruction 3. storage of
image data 4. image display
gantry correct answer -circular device that houses the x-ray tube, data acquisition
system, and detectors
-collects attenuation measurements
-can be tilted to compensate for body angle
-detectors function as IRs
with Accurate Answers
when and who first had a successful demonstration of a CT correct answer 1970
by Godfrey Hounsfield and Allan Cormack
what were the first units dedicated for correct answer head scans
what is CT correct answer the process of creating cross-sectional tomographic
plan of any part around the body
how is each image demonstrated correct answer cross-sectional format
ray correct answer x-ray beam path through the subject corresponding to each
measurement
view correct answer set of measurements made during the translation and their
associated rays
translation correct answer linear transverse scanning motion of the tube and the
detector across the subject
what are CT's benefits correct answer no superimposition, improved contrast
resolution (reduced scatter), and has image manipulation and enhancement
techniques
raw data correct answer measured x-ray transmission values
, signal strength correct answer value of each number is directly proportional to
matrix correct answer a grid of rows and columns
pixel correct answer single square, or picture element, within a matrix
volume and dimension correct answer slice thickness adds
voxel correct answer volume element of matrix; product of pixel area and slice
thickness
0
-1000
+1000 correct answer CT numbers for water, air, and bone
computer correct answer links technologist and other components of imaging
system
four functions: 1. control data acquisition 2. image reconstruction 3. storage of
image data 4. image display
gantry correct answer -circular device that houses the x-ray tube, data acquisition
system, and detectors
-collects attenuation measurements
-can be tilted to compensate for body angle
-detectors function as IRs
