Physics

Question 1

dose length time

Answer 1

VOl CTDI X scan length time

VOL CTDI = CTDI/pitch

Question 2

Dose =

Answer 2

Dose =1/pitch

Question 3

beam width =

Answer 3

no of detectors X detector width

Question 4

Mottle relationship with mA

Answer 4

inversely related to square root of the no. of e. 4mA = 1/2 mottle

4X slice thickness&raquo_space; 4X no of e&raquo_space; 1/2 mottle

Question 5

increasing the power in US

Answer 5

increasing penetration

Question 6

MI is most mportant with

Answer 6

IV US contrast. high MI > microbible rupture and cap. damage

Question 7

Improve frame rate in US

Answer 7

decrease depth, width, line density and no of focal zones

Question 8

PRF = pulses/sec = KHZ

Answer 8

= 1/ pulse rep period in sec

sec= 1000 msec

Question 9

pop a entrapment syndrome

Answer 9

medial to med head of gastroc. pulseless with dori or planter flexion

Question 10

Klippel-Trenaunay-Weber Syndrome

Answer 10

superficial AVM
hemihypertophy of LL. 
port wine stain
peristant sciatic v
marginal vein of servelle along the lat calf. 
GI bleeding

Question 11

cystic adventitial disease

Answer 11

muciod filled cysts surround pop a in young men&raquo_space; compression

Question 12

MMT of Takaysu

Answer 12

type3= Arch and Abd Ao

Question 13

MCC of 1ry vasculitis

Answer 13

GCA&raquo_space; BX for Dx
ass w/
morning stillness in shoulder and hip = polymylagia rhumatica

Question 14

vasculitis common in men

Answer 14

burger
PAN
GCA

Question 15

MMC vasculitis in kids

Answer 15

HSP&raquo_space; massive scrotal swelling

Question 16

pANCA +

Answer 16

Churg stress
microscopic polyangitis

Wegners: cANCA +

Question 17

HP vs RB and LCH

Answer 17

Respiratory bronchiolitis and Langerhans cell histiocytosis are predominantly of the upper lobe and diseases of heavy smokers.