Reference Case 3 (Breast)

 

Attached is a diagram showing the contour of the transversal projection of a left breast. On the diagram, it is marked with an “x” the location of the National Surgical Adjuvant Breast and Bowel Project (NSABP) dose prescription point.  The NSABP prescription point is located at 1/3 the height of the breast’s medio-lateral plane projection, measured at the breast’s height along the baseline’s bisector (See Figure). The NSABP prescription point depths are measured along the fan lines for each field. The off-axis distance to the

 

NSABP prescription point is measured perpendicular to the central ray.

Please calculate the treatment time, “provide computer isodose curves for fields with wedges and also wedge curves”, and any other appropriate dosimetry necessary to deliver 5000 cGy to the NSABP dose prescription point, 200 cGy/day for the given breast contour.

 

Please answer the following questions:

 

1.     Do you treat with (Check  and circle all applicable answers)

 

       Open Field: Angled, Asymetric Jaws, Wedged, Bolus

       Beam Splitter: Wedged, Bolus

 

List the following parameter:  

 

Wedge ID	Wedge Angle	Wedge factor	Method of Bolus

 

2.                 Is tray used with any of the above ?

 

      Yes ?           No?        Tray Factor:___________

 

3.   Indicate Orientation of: Wedge, Beam Splitter, Central Ray, and  where the SSD is set.

 

Breast