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Chapter 28 Computed Tomography questions with correct answers 100%.
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Chapter 28 Computed Tomographyquestions with correct answers 100%.
Helical ANS - ____ CT provides improved imaging of anatomy compromised by respiratory motion
chest
abdomen
pelvis ANS - what body parts is helical CT best for
Godfrey Hounsfield ANS - Who was the first to incorporate digital imaging with the CT scanner?
CT ANS - no other development in medical imaging over the past 50 years has been as significant as
_____
compton ANS - when the abdomen is imaged with conventional radiographic techniques, the image is
created directly on the IR and is low in contrast, principally because of _____ scatter radiation
neprotomography ANS - in _____ the renal outline is distinct because the overlying and underlying
tissues are blurred
tomosynthesis ANS - the latest advance in digital radiography is digital radiographic ____
axial tomography ANS - conventional tomography is called _____ because the plane of the image is
parallel to the long axis of the body; resulting in sagittal and coronal images
transverse ANS - a CT image is a transaxial or _____ image that is perpendicular to the long axis of the
body.
synchronously ANS - the X-ray source and the detector move ____ for CT
,translation ANS - when the source detector assembly makes one sweep, it is called ____
12 ANS - the detector signal during each translation has a dynamic range of ___ bits
5 minutes to complete image ANS - major drawback to first generation imaging system
first ANS - ____ generation imaging system: translate and rotate, pencil beam, single detector, 5 minute
imaging time
increased radiation intensity that occurs toward the edges of the beam because of body shape ANS -
major disadvantage of the fan beam in 2nd generation imaging system
speed ANS - what is the principal advantage of the second generation CT imaging system
second ANS - ____ generation imaging system: translate and rotate, fan beam, detector array, 30
second imaging time
examination time ANS - what is the principal limitation of 2nd generation CT imaging systems
occasional appearance of ring artifacts ANS - principal disadvantage of third generation CT imaging
system
third ANS - ____ generation imaging system: rotate and rotate, fan beam, detector array, sub second
imaging time
fourth ANS - ____ generation CT imaging system: rotate and stationary, fan beam, detector array, sub
second imaging time
third ANS - today essentially all CT imaging systems are ____ generation and have evolved into helical
and multislice imaging
,interpolation ANS - reconstruction of an image at any z axis position is possible because of a
mathematical process called ____
interpolation ANS - if one wishes to estimate a value between known values, it is ____
extrapolation ANS - if one wishes to estimate a value beyond the range of known values, it is ____
180 ANS - linear interpolation at ____ degrees improves z axis resolution
pitch = couch movement each 360 degrees / beam width ANS - equation for helical pitch ratio
ratio ANS - pitch is expressed as a ____
2:1 ANS - a pitch of ____ results in extended imaging and reduced patient radiation dose
1:1 ANS - increasing pitch to above ____ increases the volume of tissue that can be imaged at a given
time
ability to image larger volume of tissue in a single breath hold ANS - what is one advantage of multislice
helical CT
beam width x pitch x imaging time ANS - tissue imaged = _____
1.0 ANS - in practice, the patch for multislice helical CT is usually ____
1.0 :1 ANS - CT angiography requires a pitch of less than _____
operating console
generator
, xray tube ANS - what are the three major subsystems of conventional X-ray imaging system
operating console
computer
gantry ANS - what are the three major components of a CT imaging system
second ANS - the ____ monitor allows the operator to view images before transferring them to the
radiologist's viewing console
3 ANS - how many consoles can CT imaging systems be equipped with
120 ANS - operation is usually approximately ___ kVp, although some recent work supports reducing
patient dose by using a lower kVp
400 ANS - what is the maximum mA used
.5-5 ANS - nominal tissue thickness are ____ to ____mm
reconstruction time ANS - what do the microprocessor and the primary memory determine in CT
reconstruction time ANS - _____ is the time from the end of imaging to appearance of the image
array processor ANS - many CT imaging systems use an _____ instead of a microprocessor for image
reconstruction
xray tube
detector array
high voltage generator
patient support couch
mechanical support for each ANS - what 5 things make up the gantry
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