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CT Exam Prep > Random > Flashcards

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1
Q

“wasted radiation” that scatters beyond the edge of the detector rows:

A

overbeaming

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2
Q

irradiating tissue abaove and below the desired scan range found in helical scanning:

A

overRANGING

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3
Q

Pitch=

A

TFmmper36 degree rotation/number of detector rows *slice colimation in mm

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4
Q

what is the maximum pitch before data loss ocurrs:

A

2

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5
Q

Amathmatical formula used to convert scan data into image data:

A

reconstruction

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6
Q

Predetermined algorithms:

A

kernals

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7
Q

where are smooth kernels used:

A

brain or liver for low contrast detectability

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8
Q

where are sharp kernals used:

A

ases bone structures to increace spacial resolution

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9
Q

a post processing technique for off axis perspective of the original axial acuisition:

A

reformating

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10
Q

what post processing technique is used to make sagital and coronal iages:

A

reformated

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11
Q

contrast’s peak time for renal excreation:

A

3 min

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12
Q

urine iodine consitration is hightest at:

A

60min

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13
Q

what is an apropriate kVp for pediatric pts:

A

100

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14
Q

amount of radiation an individual is exposed to, not how much is absorbed:

A

a roentgen

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15
Q

measures the amount of radiation in the air:

A

roentgen

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16
Q

measures how much radiation is absobed:

A

Rad

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17
Q

describes the amount of radiation an individual is exposed to:

A

Rem

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18
Q

radiation absorbtion is measured in:

A

rad and rem

rem exposure

rad absorbed

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19
Q

measurment of radiation to specific tissue:

A

absorbed dose

20
Q

units of absorbed dose:

A

gy

mGy

replaced the unit rem

21
Q

measurement based on the sensitivity of the tissue exposed to radiation:

A

effective dose

22
Q

effective dose is measured in:

A

sieverts

23
Q

used to quantify the risks of developing cancer or genetic defects:

A

effective dose

24
Q

measures radiation output from the scanner:

A

CTDI

25
Q

a calculated value based on x-ray tube settings:

A

CTDIvol

26
Q

a measurment of radiation to the scan volume of a phantom

A

CTDIvol

27
Q

measurment of tube output based of kvp mas pitch and dose, estimates exposure per slice:

A

CTDIvol

28
Q

measurment of total amount of exposure for a series of scans:

A

dose length profile

29
Q

DLP=

A

CTDIvol * scan length

30
Q

used to calculate efective dose for specific CT exams:

A

DLP

31
Q

used to aproximate pt organ dose

A

CTDIvol

32
Q

mAs per slice

A

Effective mAs

33
Q

pixel size(mm^2)=

A

((dfov)(mm^2))/matrix size

34
Q

voxel size=

A

(DVOF * slice thickness)/matrix size

35
Q

ability to capture, absordb, and convert x-ray photons that have passed through a pt into an electical signal:

A

detecto/capture effciency

36
Q

quantity of x-ray photons absorbed by th detectors.

A

absorbtion efficency

37
Q

Ct detector output being proportional to photons capture:

A

linearity

38
Q

slice thickness=

A

x-ray beam thickness/number of slices

39
Q

allows the tech to interact with the imaging system

A

system console

40
Q

process/convert the analog signal to digital by using the ADC:

A

host computer

41
Q

what is located in the gantry: (6)

A

x-ray tube

slip ring

generator

collimator

detectors

DAS

42
Q

reconstructs attenuated raw data into a CT image

A

array processor

43
Q

quantity of x-radiation passing through a uniy area:

A

photon fluence

44
Q

major diadvantage of back projection:

A

star artifact

45
Q

the amount of enerrgy that passes through the PT onto the detector:

A

transmited intensity

46
Q

limiting resolution f modern scanners:

A

25lp/cm

47
Q

the distance between the centers of two adjacent reconstructed CT images:

A

section interval

CT Exam Prep (12 decks)

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