Technical standards and practice parameters - MRI, mammo, US Flashcards
screening MRI of the contralateral breast in patents with newly diagnosed breast ca detects cancer in what percent of patients?
3-5%
in what percent does MRI detect occult cancer in the ipsilateral breast, in a patient with newly diagnosed cancer?
12-27%
in what time frame is recurrence seen in a patient that has undergone mastectomy, and where is the recurrence usually seen?
within 5 years in the skin or subcutaneous tissue around the scar
should screening mammo be performed in the residual tissue after a patient has undergone mastectomy?
no
how should gad be administered in breast MRI?
0.1 mmol/kg bolus with 10 ml saline flush
what are the ACR slice thickness recommendations for breast MRI?
3 mm or less
what are the ACR recommendations for in plane axial resolution in breast MRI?
1 mm or less to decrease volume averaging
what is the best sequence to evaluate axillary nodes on MRI?
non enhanced T1 without fat saturation
in what subset of patients is MRI most useful to evaluate for extent of ipsilateral disease?
in patients with ILC or with dense breasts
what is the recurrence rate per year in patients that have undergone surgery and radiation?
1-2% per year usually in the same quadrant
what percent of patients get fat necrosis after BCT?
1/3 to 1/2
in what types of tumors is MRI best for evaluating response to treatment?
ER negative/Her2+ and those that are more aggressive. MRI is not as good for ER/PR+ and Her 2- tumors.
what are the high risk lesions?
lobular neoplasia, papilloma, ADH, flat epithelial atypia, radial scar
what are the ACR parameters for breast US transducer?
high resolution, real time linear array broad bandwidth with center of frequency at leas 12MHz or more
what is the upgrade rate of DCIS to invasive cancer?
20-25%
how soon does a health care provider have to be notified of a bi rads 4 or 5? how soon does the patient have to be informed?
within 3 days of the interpretation. patient has to be informed within 5 days
the average dose of a single CC view of a 4.2 cm compressed breast that is half fat and half FGT should not exceed?
3 mGy
MQSA requires that facilities have audit outcomes on what Bi Rads? ACR recommends what?
MQSA requires Bi rads 4 and 5 audits. ACR recommends Bi rads 0,4,5.
what can facilities refer to for information on their audit outcomes compared to other facilities?
ACR national mammography database provides benchmarking for outcomes data
what should lightbox luminance be?
3000 cd/m2
what should ambient light in mammo reading room be?
20-45 lux
mammo grids mut fit which size receptors?
18X 24 and 24X30
how much magnification should mag mammo produce?
1.4-2.0
what are the grid ratios for contact mammography?
3.5:1 and 5:1
