Rapid arc

RapidArc radiotherapy technology is a major advance that improves dose conformity while significantly shortening treatment times. RapidArc delivers treatments two to eight times faster than our fastest dynamic treatments today and increases precision - a winning combination that enables physicians to improve the standard of care and treat more patients.

Volumetric modulated arc therapy

RapidArc is a volumetric arc therapy that delivers a precisely sculpted 3D dose distribution with a single 360-degree rotation of the linear accelerator gantry. It is made possible by a treatment planning algorithm that simultaneously changes three parameters during treatment:

• rotation speed of the gantry
• shape of the treatment aperture using the movement of multileaf collimator leaves
• delivery dose rate.

Volumetric modulated arc therapy differs from existing techniques like helical IMRT or intensity-modulated arc therapy (IMAT) because it delivers dose to the whole volume, rather than slice by slice. And the treatment planning algorithm ensures the treatment precision, helping to spare normal healthy tissue.

Source-

http://www.varian.com

Correa cascade

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BIRADS

BIRADS 0: Needs additional imaging evaluation:Abnormality on screening mammogram for
which diagnostic mammogram and/or ultrasound is recommended. May also use this
if prior outside comparison is required for interpretation.


BIRADS 1: Negative mammogram: Normal


BIRADS 2: Benign finding: Either characteristic benign appearance or a known prior biopsied lesion


BIRADS 3: Probably benign finding, initial short-term interval follow-up suggested:
<2% risk of malignancy; should only be used on diagnostic studies, not straight off of a screening abnormality. Usually performed at 6-month intervals.


BIRADS 4: Suspicious finding, intervention suggested (i.e., biopsy)

4a: Low suspicion for malignancy, still requiring intervention (e.g., probable fibroadenoma, but biopsy suggested)

4b: Intermediate suspicion for malignancy

4c: Moderate concern, but not classic for malignancy

BIRADS 5: Highly suggestive of malignancy. Appropriate action should be taken: Almost certainly malignant; >95% risk of malignancy.


BIRADS 6: Known biopsy-proven malignancy. Appropriate action should be taken: For biopsy-proven lesions prior to definitive therapy; often used for monitoring patients on neoadjuvant chemotherapy or for second opinions.