ct scan

Question 1

a ct scan creates ___ ___ images or ___ of the body

Answer 1

cross sectional/slices

Question 2

1972 - ___ ___ scanner/___ scanner first scan by sir ___ ___

Answer 2

brain tissue scanner/EMI scanner first scan by sir godfrey hounsfield

Question 3

1974 - ___ computerized ___ axial scanner first whole body scanner by dr. ___ ___

Answer 3

automated computerized transverse axial scanner first whole body scanner by dr robert ledley

Question 4

pencil beam with 1- 3 detectors

head scanner

translate/rotate

Answer 4

first gen

Question 5

narrow fan beam with 5-30 detectors

head & body scanner

Answer 5

second gen

Question 6

wide fan beam with 750-1000 curvilinear detectors

rotate/rotate

ring artifact

Answer 6

third gen

Question 7

wide fan beam with detector ring

rotate/stationary

Answer 7

fourth gen

Question 8

electron beam CT

heart scanner

stationary/stationary

Answer 8

fifth gen

Question 9

dual source gen with slip ring technology

spiral/helical

by Will Kalender and Kazuhiro Katada

Answer 9

sixth gen

Question 10

cone beam with multiple detector

turbo charged spiral geometry

multi slice with flat panel

Answer 10

seventh gen

Question 11

largest component

Answer 11

gantry

Question 12

opening in gantry with 28” diameter

Answer 12

aperture

Question 13

generates xray beam

Answer 13

xray tube

Question 14

3 anode material

Answer 14

tungsten
rhenium
molybdenum

Question 15

restricts useful xray beam

with pre-px and post-px collimators

Answer 15

collimator assembly

Question 17

absorbs radiation and converts to electrical signal

Answer 17

xray detector

Question 18

measures transmitted radiation beam and encode it to binary data

Answer 18

data acquisition system

Question 19

image manipilation, storage and communication

Answer 19

computer

Question 20

to move increments

Answer 20

px couch/table

Question 22

movement of px couch

Answer 22

indexing

Question 23

3 phase power for efficient production of xrays

Answer 23

high voltage generator

Question 24

convolution filters

Answer 24

kernels

Question 25

array of numbers in rows and columns

Answer 25

matrix

Question 26

2D representation of tissue

Answer 26

pixel

Question 27

tissue volume

Answer 27

voxel

Question 28

diameter of an area

Answer 28

field of view

Question 29

numerical information contained in each pixel

Answer 29

housfield units/CT numbers

Question 30

gray level mapping that allows alteration

Answer 30

windowing

Question 31

in windowing, it is the midpoint of range of gray levels

Answer 31

window level

Question 32

in windowing, it is used to map signals into shades of gray

Answer 32

window width

Question 33

detail or degrees of blurring

Answer 33

spatial resolution

Question 34

to distinguish material of one composition to another without regarding to size and shape

Answer 34

contrast resolution

Question 35

large numbr of pixels or graininess

Answer 35

noise

Question 36

traditional method of image reconstruction 2D to 3D

Answer 36

filtered back projection

Question 37

vital in order for the radiologist to create precise diagnosis

Answer 37

complete history taking and informed consent

Question 38

one of contraindications

Answer 38

pregnancy

Question 39

given when there is proper consent

Answer 39

sedation

Question 40

technique that involves injection

Answer 40

CT angiography

Question 41

enhances visualization of gallblafdet and reduce gas build up

Answer 41

8 hrs fasting

Question 42

3Ks

Answer 42

know your px know the procedure know the machine

Question 43

what to check before procedure?

Answer 43

creatinine metformin allergy

Question 44

indicates kidney function

Answer 44

creatinine

Question 45

creates a toxic chemical inside the body - lactic acidosis

Answer 45

metformin

Question 46

may lead to anaphylactic shock use non ionic, iso osmular cm instead

Answer 46

allergy

Question 47

4 common ct positioning

Answer 47

head first supine head first prone feet first supine feet first prone

Question 48

head and neck procedures

Answer 48

brain/skull orbital facial bone pns temporal neck cervical spine

Question 49

chest and thoracic procedures

Answer 49

chest hrct cardiac thoracic spine

Question 50

wab procedures

Answer 50

wab plain wab triphasic wab triple upper abd lower abd stonogram and urogram lumbosacral

Question 51

musculoskeletal procedures

Answer 51

upper ext lower ext