Scintigraphy

Question 1

technetium __m is MC

Answer 1

99; used in bone scans

Question 2

scintigraphy ID’s…

Answer 2

physiological activity in organs and bones

Question 3

characterizes areas of…

Answer 3

abnormally high/low metabolic activity

Question 4

3 types of bones scans: Whole body

Answer 4

images of entire skeletal system, used for systemic bony disorders (metastasis, arthritis)

Question 5

3 types of bones scans: Limited (pin-hole views)

Answer 5

images of specific region, typically used for fractures (especially occult.stress fractures)

Question 6

Hot spot

Answer 6

area of increased physiological activity

Question 7

cold spot

Answer 7

area lacking vascualr suply (abscess/avascular necrosis)

Question 8

20mCi of technetium-99m-MDP has effective dose

Answer 8

of 3 mSv whole body; 4.8 hour effective half life (incorps isotope decay plus body’s efforts to clear radioisotpe thru excreition via urinary system)
6 hour half life (raw rate of decay of isotope - absent any help form body to excrete it)
24 hour biological half-life (93% decayed in 24 hours)