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Dosimetry > CT Sim > Flashcards

CT Sim Flashcards

1
Q

ct external gantry components

A

couch, tilt, emerg off buttons, lasers

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2
Q

internal ct components

A

detector array, x-ray tube

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3
Q

ct info recorded by

A

solid state image detectors or gas filled detectors

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4
Q

ct ray is the part of the beam that

A

falls on one detector

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5
Q

ct view is one complete translation generating ?

A

profile or projection

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6
Q

ct image matrix is an image displayed in

A

rows & columns

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7
Q

ct pixel is each cell on the image

A

matrix

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8
Q

ct voxel is each

A

pixel & slice thickness or volume

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9
Q

ct filter back projection is summation method of

A

reconstructing data; avg linear attn coefficient per pixel

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10
Q

ct pitch is the distance traveled by

A

couch during x-ray tube rotation

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11
Q

in inverse planning, planner specifies

A

desired dose limits & computer produces plan

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12
Q

ct contrast is shades of

A

grey

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13
Q

beam hardening artifacts appear and are where

A

dark bands often near bone

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14
Q

ring artifact appears if what’s not working

A

detector

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15
Q

motion artifact appears as

A

streaks or less resolution or partial volume artifact

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16
Q

helical artifact appears as

A

object shape distortion

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17
Q

ct window width (WW) is a range of

A

’s displayed or the contrast

18
Q

ct window level (WL) represents

A

central HU of all CT #s w/i the WW

19
Q

incr WW, ? contrast

A

decr

20
Q

decr WW, contrast

A

incr

21
Q

incr WL= ? image

A

darken

22
Q

decr WL= ? image

A

brighten

23
Q

dicom stands for

A

digital imaging & communications in medicine

24
Q

scintillation detector contains ? assemblies

A

crystal photodiode assemblies

25
Q

ct crystal of choice

A

CdWO4 (Cadmium Tungstate)

26
Q

narrow WW= ? contrast on DRR

A

incr

27
Q

projection is an intensity pattern created from

A

linear attn coefficient

28
Q

average ct dose per CT slice ?

A

1-6 cGy

29
Q

EPID components

A

cathode tube/tv monitor, charged couple device/TV camera, metallic fluoro screen

30
Q

ct # fat

A

-100

31
Q

ct pitch determines closeness of

A

helix

32
Q

high matrix= ? pixel

A

small

33
Q

small pixel= ? resolution

A

high

34
Q

high resol= ? noise

A

high

35
Q

small pixel size = ? noise

A

more

36
Q

incr mA= ? noise

A

less

37
Q

incr kvp= less

A

noise

38
Q

incr FOV= ? noise

A

less

39
Q

incr pixel size= less

A

noise

40
Q

incr thickness= ? noise

A

less

41
Q

ct window level changes

A

density

Dosimetry (53 decks)

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