Mamms physics and trivia Flashcards
Most penetrating target/filter
W/Ag
why use grid in mammo
increase contrast at increased dose
how much breast tissue attenuates half the beam
1 cm (3 cm in conventional x rays)
typical kVp for mammo
25-35
tube current for large and focal spots
large - 0.3 mm = 100 ma
small - 0.1 mm = 25 ma
mag views compared to routine differences
more motion blur less scatter less noise decreased source to object distance no change in contrast
standard focal spot for mammo
0.3 mm
recommended source to image distance in mammo
50-70 cm
focal spot for mag view
0.1 mm
mammo phantom used for what
weekly testing of system imaging performance
Heel effect in mammo
cathode side of the tube near chest wall (thickest part)
Axial resolution of US increased by what
higher transducer frequency
broader bandwidth
shorter pulse length
what is the detector material in molecular breast imaging
cadmium zinc telluride
what is the dominate photon interaction for creating soft tissue contrast in mammo
photoelectric effect
noise is primarily determined by what parameter
mA (quantum mottle)
avg dose to a breast
3 mGy
what benign lesion can demonstrate classic malignant characteristics on MRI
fat necrosis (rim enhancement)
Poland syndrome assoc with what cancers
breast
leukemia
non-hodgkin lymphoma
lung
Multicentric breast CA
masses in more than one quadrant
Multifocal breast CA
more than one mass in a single quadrant
management of pseudoangiomatous stromal hyperplasia (PASH)
surgery if enlarging
patient concerns
atypical features
what percent of phyllodes are malignant
10% - surgery - axillary mets are uncommon
Trabecular thickening and skin thickening
inflammatory carcinoma
mastitis (S. aureus)
DDX for architectural distortion
malignancy complex sclerosing lesion sclerosing adenosis trauma postsurgical scar
