MIDTERMS

Question 1

most prominent part of a CT scanner

Answer 1

gantry assembly

Question 2

a plane that divides the body into inferior and superior

Answer 2

transverse/axial

Question 3

a plane passes vertically through the midline of the body dividing the body into right and left pairs

Answer 3

sagittal

Question 4

a plane that divides the entire body or a body part into anterior and posterior

Answer 4

coronal

Question 5

receive and convert xray photons to digital signal

Answer 5

detectors

Question 6

efficiency to receive photons

controlled by detector size and interspacing

Answer 6

capture efficiency

Question 7

efficiency to convert photons to light or ions; controlled by detector material, size and thickness

Answer 7

absorption efficiency

Question 8

efficiency to convert light or ions to digital signal

Answer 8

conversion efficiency

Question 9

overall efficiency

Answer 9

detector dose efficiency

Question 10

the ability to maintain in a quality calibrated state

fixed detector arrays are the most stable

Answer 10

stability

Question 11

the speed of the detector to react/recognize incoming xray photons and recover for the next input

Answer 11

response time

Question 12

describe the range of xray intensities a detector can differentiate; a high dynamic range provides the discrimination between small differences in x-ray attenuation

Answer 12

dynamic range

Question 13

consists of scintillation crystals and photomultiplier
tube

Answer 13

solid state

Question 14

consists of pressurized gas filled (inert-noble gases) ionization chambers and tungsten electrode plate

Answer 14

gas filled

Question 15

localizing the target area

Answer 15

grid application

Question 16

measurements, outlining area of interest, marker of area

Answer 16

cursor

Question 17

integration with dosimetric data

Answer 17

radiation therapy planning

Question 18

directional or negative reverse

Answer 18

reverse display

Question 19

up to 3x without distortion

Answer 19

magnification

Question 20

deletion of unwanted parts
from reconstructed image

Answer 20

suppression

Question 21

labeling and text adding

Answer 21

annotation

Question 22

controls data acquisition, process and display and storage, access to software programs

Answer 22

computer

Question 23

a radiographic technique used for showing true dimensions by moving a narrow orthogonal beam of xrays along the length of the structure being measured

could also apply the particular planning for specific structure

Answer 23

scanogram

Question 24

reconstruction of images from the information from a series of a sectional images to produce an image of a section not actually scanned

Answer 24

reformatting

Question 25

magnification reformatting of the selected area with minimal distortion

Answer 25

targeting

Question 26

tissue density values that represents the linear attenuation coefficient equivalent of various tissues

Answer 26

CT numbers/Hounsfield unit

Question 27

premedication: 50 mg of ___________ 13 hours, 7 hours and 1 hour prior to procedure 50 mg of ___________ 1 hour prior to procedure

Answer 27

premedication: 50 mg of PREDNISONE 13 hours, 7 hours and 1 hour prior to procedure 50 mg of BENADRYL 1 hour prior to procedure

Question 28

is a severe and potentially life threatening allergic reaction that occurs rapidly after exposure to an allergen

Answer 28

anaphylaxis

Question 29

also known as urticaria are a common skin reaction characterized by raised, red, itchy welts or bumps on the skin

Answer 29

hives