ABR Practice Exam Question 4 – Accelerated Partial Breast Irradiation (APBI)

August 22, 2009 · Written by MDPhysics.com · mdphysicsblog@gmail.com

Which of these statements is/are not correct regarding “Accelerated Partial Breast Irradiation” (APBI)?

1- APBI can be treated with external beam and mammosite only.

2- External beam based approaches seem to minimize the risk of seroma formation and infection compared to brachytherapy.

3- Radiation dose to uninvolved ipsilateral breast, heart and lung using brachytherapy technique is lower than other techniques.

4- IMRT technique improves upon 3D-CRT approach by enhancing conformity dose to tumor with a possible increase radiation dose to the uninvolved ipsilateral breast, heart and lung.

5- The PTV used for brachytherapy planning is typically smaller than the PTV for external beam technique, however, brachytherapy results in a significant dose inhomogenity.

Don’t take the exam if you don’t know the answer of this question.

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One Response to “ABR Practice Exam Question 4 – Accelerated Partial Breast Irradiation (APBI)”

  1. randy holt on October 15th, 2009 11:01 am

    #1 is wrong for another reason. Mammosite is a trade name that is specific to the Balloon used, and is not the only option for treating APBI brachytherapy. Contoura, Savi and Xoft are other (current) options.

    #4 is not exactly wrong. Firstly, the word ‘possible’ makes this statement logically impossible to be right or wrong. Secondly, very few IMRT plans are better ‘more conformal’ than simple forward planned field in field (which really still counts as 3DCRT, as IMRT requires inverse planning, not just modulation), except in a small percentage of oddly shaped patients. Most IMRT plans with better conformance do so at the expense of increased dose to heart and lungs.

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