Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2007  |  Volume : 32  |  Issue : 1  |  Page : 12-17

Advantages of mini-multileaf in stereotactic radiotherapy


Department of Radiotherapy, Apollo Specialty Hospital, Chennai, India

Correspondence Address:
A Sankar
Department of Radiotherapy, Apollo Speciality Hospital, 320, Mount Road, Chennai - 600 035
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.31144

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Over the past few decades, cones of different diameter (12.5 mm to 40 mm) were used for treatment of intracranial lesions. These give very focused dose delivery to the target with minimum dose to outside normal brain tissues. This study is intended to compare the older method of arc-based stereotactic treatments using cones with the new mini-multileaf collimator (mMLC). Treatment plans are made for various sites of intracranial lesions with the cones and mMLC. In case of nonspherical lesions, more than one isocenter is used to get an optimum dose distribution with cones, while a single isocenter is sufficient with mMLC. Treatment plans are compared for irregular lesions using cones with multiple isocenters and mMLC. It is observed that conformity index and dose heterogeneity are better for mMLC based treatments.


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