M8L3 - mammography

how are patients positioned

mediolateral oblique projection

what should the kVp for breasts

22-28

why do we use small mA for mammography

so anode can tolerate heat generated

what is the mA range

20-100

what ist he distance

60-80 cm

what is the angle

20

why do we need a small focal spot

for greater spatial resolution

if the focal spot is 0.1/0.3 what is the angle used

24

how is the heel affect used in mammography

positioning the cathode towards teh chest to have uniform optical density because the tissue towards the chest is thicker

what is the target material

tungstun, molybdenum, rhodium

what is the most common material

molybdenum

why is tungstun not the best material

provides many xray ranges thus produces xray above and below ranges thus increases patient dose and edcrease image quality

why not rhodium

give shte patient more dose

what is rhodium better for

glandular or dense breast tissue

why is rhodium better for that

high kev photons can penetrate it better

why is the window of the tube in mammorgrpahy now in atomic number

to decrease attenuation to create a better picture

where is the AEC located

compression paddle

where do we want AEC to be activated

beneath densest tissue