Mamms physics and trivia

Question 1

Most penetrating target/filter

Answer 1

W/Ag

Question 2

why use grid in mammo

Answer 2

increase contrast at increased dose

Question 3

how much breast tissue attenuates half the beam

Answer 3

1 cm (3 cm in conventional x rays)

Question 4

typical kVp for mammo

Answer 4

25-35

Question 5

tube current for large and focal spots

Answer 5

large - 0.3 mm = 100 ma

small - 0.1 mm = 25 ma

Question 6

mag views compared to routine differences

Answer 6

more motion blur
less scatter
less noise
decreased source to object distance
no change in contrast

Question 7

standard focal spot for mammo

Answer 7

0.3 mm

Question 8

recommended source to image distance in mammo

Answer 8

50-70 cm

Question 9

focal spot for mag view

Answer 9

0.1 mm

Question 10

mammo phantom used for what

Answer 10

weekly testing of system imaging performance

Question 11

Heel effect in mammo

Answer 11

cathode side of the tube near chest wall (thickest part)

Question 12

Axial resolution of US increased by what

Answer 12

higher transducer frequency
broader bandwidth
shorter pulse length

Question 13

what is the detector material in molecular breast imaging

Answer 13

cadmium zinc telluride

Question 14

what is the dominate photon interaction for creating soft tissue contrast in mammo

Answer 14

photoelectric effect

Question 15

noise is primarily determined by what parameter

Answer 15

mA (quantum mottle)

Question 16

avg dose to a breast

Answer 16

3 mGy

Question 17

what benign lesion can demonstrate classic malignant characteristics on MRI

Answer 17

fat necrosis (rim enhancement)

Question 18

Poland syndrome assoc with what cancers

Answer 18

breast
leukemia
non-hodgkin lymphoma
lung

Question 19

Multicentric breast CA

Answer 19

masses in more than one quadrant

Question 20

Multifocal breast CA

Answer 20

more than one mass in a single quadrant

Question 21

management of pseudoangiomatous stromal hyperplasia (PASH)

Answer 21

surgery if enlarging
patient concerns
atypical features

Question 22

what percent of phyllodes are malignant

Answer 22

10% - surgery - axillary mets are uncommon

Question 23

Trabecular thickening and skin thickening

Answer 23

inflammatory carcinoma

mastitis (S. aureus)

Question 24

DDX for architectural distortion

Answer 24

malignancy
complex sclerosing lesion
sclerosing adenosis
trauma
postsurgical scar

Question 25

Paget disease of the breast is most closely related to what cancer

Answer 25

DCIS