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CT SCAN PRELIMS REVIEWER EXAM QUESTIONS AND ANSWERS
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CT SCAN PRELIMS REVIEWER EXAM QUESTIONS AND ANSWERS
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CT SCAN PRELIMS REVIEWER EXAMQUESTIONS AND ANSWERS
Common cuts for CT (cranial) - Answer-5mm
One of the principal disadvantages of third-generation CT imaging systems is the
occasional appearance of ______ - Answer-ring artifacts
There were ______ recognized generations of CT scanners; however, newer scanners
are no longer categorized by generation but by _________ - Answer-four, tube and
detector movement
What is the specific problem or limitation of x-ray that CT scan can overcome? -
Answer-Superimposition
As a 2-D image, conventional radiograph only possesses the? - Answer-width and
height
In a 3-D view, the image possesses the: - Answer-width, depth, height
Scans thin sections of the body with a narrow x-ray beam that rotates around the body,
producing images of each cross section - Answer-computed tomography (CT) scan
3 types of cross sections - Answer-axial, sagittal, coronal
Axial images are produced after? - Answer-Reconstruction
First data produced during scanning - Answer-raw data/raw cuts
Xray technical factors - Answer-kvp, mas, collimation
CT technical factors - Answer-kvp, mas, slice thickness, space gap, pitch, FOV
The smaller the slice thickness, the ______ - Answer-higher resolution
Major limitation of conventional radiography (x-ray) - Answer-Superimposition
Disadvantage of small cuts (ex: 2mm over 5mm) - Answer-high heat capacity, high
patient dose (because of increased/doubled scanning time)
If any single detector or bank of detectors malfunctions, the acquired signal or lack
thereof results in a _____ on the reconstructed image. - Answer-ring artifact
First cross sectional image produced after scanning - Answer-axial cuts
, Usually the only factor manipulated during CT scanning - Answer-slice thickness
Usual dose for CT scan - Answer-7000 mas
Another limitation of the conventional radiograph is its inability to distinguish between to
tissues with similar densities; otherwise called? - Answer-contrast resolution
The smaller the slice thickness, the ______ - Answer-higher patient dose
Views that are only possible after reconstruction - Answer-sagittal, coronal
Modality with the highest absorbed dose - Answer-CT scan
Preparation for KUB - Answer-full bladder (bladder should be expanded)
Distinguishes difference between bone and soft tissues - Answer-spatial resolution
Tomo - Answer-the word tomography has its root word ____
Limitations of x-ray that CT scan can give - Answer-three-dimensional view,
superimposition, contrast resolution
The unique physics of _____ allow for the differentiation between tissues of similar
densities - Answer-CT scan
In the case of CT, a sophisticated computerized method is used to obtain data and
transform them into ____ of the human body - Answer-cuts/cross-sectional slices
All early scanners produced axial cuts; therefore it was common to refer to older
scanning systems as? - Answer-computerized axial tomography (CAT) scan
Once the raw image is reconstructed to another plane (from axial to sagittal/coronal),
the resolution is ______ - Answer-degraded
CT scan manufacturers - Answer-GE, Siemens, Toshiba
CT scan is best to diagnose ______ - Answer-appendicitis
GE image feature is called? - Answer-scout
Siemens image feature is called? - Answer-Topogram
Toshiba image feature is called? - Answer-Scanogram
Who invented hot cathode ray tube - Answer-William Coolidge
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