Simple technique for fabrication of shielding blocks for total body irradiation at extended treatment distances

Techniques are being standardized in our department for total body irradiation (TBI) with six MV photons in linear accelerator for preconditioning to bone marrow transplantation (BMT). Individualized shields with low melting point alloy are to be fabricated for shielding critical organs such as lung...

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Bibliographic Details
Published in:Journal of medical physics 2009-10, Vol.34 (4), p.223-225
Main Authors: Ravichandran, R, Binukumar, J P, Davis, C A, Zahid, A M, Rajan, B
Format: Article
Language:English
Subjects:
Accuracy
Alloys
Health aspects
Lungs
Magna field radiotherapy
Radiation therapy
Radiography
Radiotherapy
shielding in TBI
Technical Note
total body irradiation
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Summary:Techniques are being standardized in our department for total body irradiation (TBI) with six MV photons in linear accelerator for preconditioning to bone marrow transplantation (BMT). Individualized shields with low melting point alloy are to be fabricated for shielding critical organs such as lungs, kidneys etc. A method to mount diminished dimension of shields in a tray at 3.75m is designed in the department for a teletreatment distance of four meters with magna field with A simulator image taken with the patient's midplane (MP) at one meter distance is used to mark the dimensions of lung, scaled down by a factor of 3.75/4.0. These lung dimensions are reprinted from the digital simulator image for making the shield. The methodology of the technique using digitized minification in radiography is the first of its kind to be used for shield cutting in magna field radiotherapy.
ISSN:0971-6203
1998-3913
DOI:10.4103/0971-6203.56084