Ct Exam 3

Front 1

Which registry collects CT exam doses and so that they may be used for comparison with other facilities?

Back 1

Dose index registry

Front 2

What invention allows for the continuous rotation of the tube around the patient?

Back 2

Slip ring

Front 3

When the slice thickness is equal to the pixel size, the data acquired are said to be

Back 3

Isotropic

Front 4

If the collimated beam width is 24 mm and their are 4 detector rows, what is the slice thickness of each slice?

Back 4

6 mm

Front 5

In MSCT, a __________ type beam is used rather than a fan beam like in SSCT

Back 5

Cone

Front 6

What was the first dose descriptor to be identified?

Back 6

MSAD

Front 7

The overall goal of MSCT is to:

Back 7

Improve volume coverage speed

Front 8

What device is used to measure patient exposure by use of a phantom and multiple ports?

Back 8

Pencil ionization chamber

Front 9

If pitch is increased and all other factors are unchanged the affect on the dose is

Back 9

Dose decreases

Front 10

What is the unit of measure for exposure?

Back 10

Roentgen

Front 11

What is the ideal pitch in spiral CT?

Back 11

1

Front 12

What is the dose unit of measurement for CTDI?

Back 12

Gray

Front 13

What is the term used to describe the travel speed of the table for each revolution of the tube-detector?

Back 13

Pitch

Front 14

In which method of CT scanning does and interscan delay exist?

Back 14

Slice-by-slice CT

Front 15

What term is used to describe the instrumentation and measurement of patient dose in CT?

Back 15

CT dosimetry

Front 16

Whichof the following best describes the beam geometry for single-slicespiral/helical CT scanners?

Back 16

a fan-shaped

Front 17

The easiest and probably the most accuratemethod of measuring the dose in CT is:

Back 17

pencil ionization method

Front 18

Theaverage dose to the patient from a series of scans is the:

Back 18

MSAD

Front 19

Thequantity measured by the pencil ionization chamber technique is the:

Back 19

CTDI

Front 20

Thedose to the patient is increased if:

i. Noisedecreases
ii. Slicethickness decreases
iii. Pixelwidth decreases iv. mAsis increased and kVp is decreased

Back 20

1, 2, 3, and 4

Front 21

Which ofthe following concept/principle/action deals with the intelligent use ofradiation as a radiation protection measure?

Back 21

Justification

Front 22

The definition of pitch in a multislice scanner,as defined by the International Electrotechnical Commission, states:

Back 22

P= distance the table travels per rotation (d)/total collimation (W)

Front 23

Pitchdirectly relates to:

i. Patientcomfort ii. Patientdose
iii. Volumescanned

Back 23

2 and 3

Front 24

Inmultislice computed tomography, a beam geometry results, rather than a fan beamas in single-slice computed tomography scanners.

Back 24

cone

Front 25

All of the following are materials used insolidstate detectors except:

a. calcium tungsten
b. gadolinium oxisulfide
c. gadolinium oxide
d. yttrium-gadolinium oxide

Back 25

calcium tungsten

Front 26

When the slice thickness is equal to the pixelsize, the date acquired are said to be:

Back 26

Isotropic

Front 27

Oneof the major challenges for imaging a rapidly beating heart is that the imagingmodality:

Back 27

must provide high temporal resolution

Front 28

Which of the following is defined as a CTimage of blood vessels opacified by contrast media?

Back 28

CTA

Front 29

The following arecrucial steps in carrying out a CTA examination, except:
a. the patient must be placed in the supine position.
b. patient preparation and acquisition parameters
c. contrast medium administration
d. image postprocessing techniques

Back 29

the patient must be placed in the supineposition.

Front 30

In which of the following is the dataset forevery 60 degree acquisition added while the dataset for the previous image isdiscarded as new 60 degree data sets are processed?

Back 30

fast continuous scanning

Front 31

Inwhich of the following are pixels farthest away from the viewer darker, whichthose pixels closer to the viewer are lighter?

Back 31

shaded surface display

Front 32

Which of the following uses the entire data set in 3D space to producegood quality images but requires morecomputing power?

Back 32

volume rendering

Front 33

Which of the following allows for the creationof inner views of tubular structures for the purpose of enhancing diagnosis?

Back 33

CT fluoroscopy

Front 34

Which of the following is a branch of computerscience that allows users to interact with 3D scenes, in a computer-generatedenvironment?

Back 34

virtual reality

Front 35

Volume rendering algorithms typically use of the data in 3D space:

Back 35

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