protocol

Question 1

dipridamole

Answer 1

hold for 24-48 hours, if used with adenosine or regadenoson their half lives are prolonged due to inhibition, very rare to cause AV block

Question 2

adenosine causes av block in

Answer 2

7.6%, 2nd degree 4% and complete <1 %

Question 3

Presence of 2nd/3rd degree of SSS

Answer 3

contraindication to adenosine, regadenoson or dipyridamole

Question 4

Rest or pharm stress wait

Answer 4

30 mins - 60 mins for hepatobiliary activity to clear

Question 5

exercise stress wait

Answer 5

10-15 mins minimal hepatobiliary activity

Question 6

if you scan and stomach or intestine too hot

Answer 6

have pt drink water

Question 7

liver to hot on scan or intestine

Answer 7

wait

Question 8

prone positioning can cause

Answer 8

artifactual anteroseptal defect 2/2 to increased sternal attenuation

Question 9

acquisition time supine vs prone

Answer 9

reduced in prone by 20-40%

Question 10

Acquisition energy window w/in

Answer 10

20% so for Tc99 126-154

Question 11

Simultaneous protocol images are acquired

Answer 11

at the same time

Question 12

simultaneous protocol images injection

Answer 12

inject with thalium normal 3-4 millicuries, stress with low dose of Tc99

Question 13

motion artifact

Answer 13

creates a hurrican effect which MC correct for but only in vertical plane (horizontal and rotational motion cant be corrected)

Question 14

Ramp filter

Answer 14

seen during filtered back projection uaing a ramp filter we get loss of counts in adjacent myocardial walls

Question 15

ring artifacts

Answer 15

seen with nonuniformity across the camera head (check by daily floods)

Question 16

skewed artifacts

Answer 16

error in COR cause misregistration

Question 17

whats minimum peak pixel count in LV for Tc 99on planar spect

Answer 17

200count/pixel

Question 18

whats minimum peak pixel count in LV for thalium on planar spect

Answer 18

100 count/pixel

Question 19

Counts in myocardium influenced by

Answer 19

body habitus/mass index, Level of exercise of pharm stresss, administered dose or radiopharmaceutical, acquistion time energy window and type of collimator

Question 20

TID is caused by

Answer 20

3vessel or microvessel disease

Question 21

number of recommended projections for Tc99

Answer 21

60-65 (related to optimal resolution of imaging system)- higher resoluion than thalium

Question 22

number of recommended projections for Thalium

Answer 22

lower resolution so 32 are acceptable

Question 23

when preforming SPECT thalium 201 we get home many different energy peaks to help max counts

Answer 23

3 help to reduce radiation dose

Question 24

probability of specific type of interaction is baed on

Answer 24

number of protons (Z number) and energy of proton

Question 25

Butterworth filter

Answer 25

is a way of adhancing signal to noise ration, So to make image les noisy you increase the power factor

Question 26

difference between X ray vs gamma ray as source

Answer 26

X ray is not discrete but is rather range of energy depending on electron shell. which negatively impact image quality

Question 27

radionuclude impurity

Answer 27

the presence of 99MO in a 99TC is considered

Question 28

further the positron travels before annilation the ____ to the image

Answer 28

the worse the image because less ability for spatial resolution

Question 29

photoelectoron tubes work by

Answer 29

light striking the photocathode which is negatively charged. low energy electrons are ejected when light stikes which of the following

Question 30

Transient equilibrium is

Answer 30

99MO/99Tc

Question 31

secular equilibrium

Answer 31

Rhobidium and strontium

Question 32

isomeric transition of technesium result in

Answer 32

only the energy state of on nucleon changes. Positrons are given off when a proton changes into a neurtron in positron decay

Question 33

characteristic radiation

Answer 33

given off when electron gives off energy as it moves to fill a vacancy by another electron being ejected through internal conversion

Question 34

multiple pinhole collimators causes

Answer 34

increase sensitivity and spatial resolution during SPECT

Question 35

99Mo/99Tc the max 99Tc is obtained how many hours after the last elution of 99Tc

Answer 35

24 hours