Intravascular Brachy

Question 1

restenosis can be reduced by ? irradiation with ?

Answer 1

intraluminal irrad w/balloon angioplasty

Question 2

arteries can be blocked by

Answer 2

atherosclerosis or plaque

Question 3

target volume of artery is ? cm in length

Answer 3

2-5 cm

Question 4

tx planning for intravascular requires a ? conformal dose distribution

Answer 4

high

Question 5

depth dose for intravascular is ? from center

Answer 5

2 mm

Question 6

most common sources for temp intravascular

Answer 6

catheter based sealed sources

Question 7

most common sources for perm intravascular

Answer 7

radioactive stents

Question 8

intravascular temp dose ? Gy

Answer 8

15-20 Gy

Question 9

pros beta over gamma for activity in intravascular

Answer 9

high specific activity

Question 10

cons of beta for intravascular re: falloff

Answer 10

extremely rapid radical falloff

Question 11

beta/gamma better in terms of dose rate per unit-activity for intravascular?

Answer 11

beta better

Question 12

beta/gamma better in terms of radical dose distrib for intravascular

Answer 12

gamma better

Question 13

Ir-192 used in intravasc

Answer 13

yes

Question 14

Cordis Checkmate used for what brachy

Answer 14

intravascular

Question 15

cordis checkmate with intravasc uses what source

Answer 15

Ir-192

Question 16

guidant galileo with intravasc uses what source

Answer 16

B sources (P-32)

Question 17

nova beta-cath intravasc uses what source

Answer 17

B of Sr/Y-90

Question 18

ß liquid filled balloon advantage in tx planning

Answer 18

centering & dose conformity

Question 19

radioactive stents use what sources

Answer 19

P-32, Y-90, V-48

Question 20

bypass surgery can be tx using

Answer 20

intravascular brachy

Question 21

PTCA (percutaneoustransluminal coronary angioplasty) can be tx using

Answer 21

intravascular brachy

Question 22

high restenosis (problem- from clotting or neointimal growth) can be tx using

Answer 22

intravascular brachy

Question 23

target volume of artery is ? thickness

Answer 23

0.5-2 mm

Question 24

tx planning for intravascular gives a ? dose beta & ? dose rate & greater protection than ?

Answer 24

high; higher; gamma

Question 25

intravascular temp source location= ? from center

Answer 25

2 mm

Question 26

intravascular dose rate= ?Gy/min

Answer 26

5 Gy/min or greater

Question 27

pros beta vs gamma for t1/2 for intravascular

Answer 27

longer t1/2

Question 28

I-125 used for intravasc?

Answer 28

yes

Question 29

Pd-103 used for intravasc?

Answer 29

yes

Question 30

P-32 used for intravasc?

Answer 30

yes

Question 31

Sr/Y-90 used for intravasc?

Answer 31

yes

Question 32

ß filled balloon isotopes used

Answer 32

P-32, Y-90, Re*-188 (preferable)

Question 33

radioactive stents disadvantage of dose

Answer 33

dose inhomogeneity b/c of structure of stent