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

Ravichandran R, Binukumar JP, Davis CA, Zahid AM, Rajan B - J Med Phys (2009)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Medical Physics Unit, National Oncology Center, Royal Hospital, Muscat, Sultanate of Oman.

ABSTRACT
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.

No MeSH data available.


Position of Styrofoam Shield Template on Beam Spoiler in Verification Radiography
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Figure 0002: Position of Styrofoam Shield Template on Beam Spoiler in Verification Radiography

Mentions: An Acuity simulator (M/s Varian AG, USA) has provision for acquisition of radiograph digitally using electronic imaging system. The volume of lung to be shielded is delineated on the radiograph acquired in the simulator with the patient's midplane positioned at an isocenter distance of one meter using Varis-Vision (Varian Ag, USA) tools with the required magnification factor. The patient's MP is positioned at four meters and the shield is placed at the position of beam spoiler (BS) plane [Figure 2]. The required minification factor on the digital image of the lungs is 3.75/4.0 is equal to 0.9375. The shields are fabricated for the minified size so as to provide correct shielding dimensions on the patient's MP.


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

Ravichandran R, Binukumar JP, Davis CA, Zahid AM, Rajan B - J Med Phys (2009)

Position of Styrofoam Shield Template on Beam Spoiler in Verification Radiography
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2807145&req=5

Figure 0002: Position of Styrofoam Shield Template on Beam Spoiler in Verification Radiography
Mentions: An Acuity simulator (M/s Varian AG, USA) has provision for acquisition of radiograph digitally using electronic imaging system. The volume of lung to be shielded is delineated on the radiograph acquired in the simulator with the patient's midplane positioned at an isocenter distance of one meter using Varis-Vision (Varian Ag, USA) tools with the required magnification factor. The patient's MP is positioned at four meters and the shield is placed at the position of beam spoiler (BS) plane [Figure 2]. The required minification factor on the digital image of the lungs is 3.75/4.0 is equal to 0.9375. The shields are fabricated for the minified size so as to provide correct shielding dimensions on the patient's MP.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Medical Physics Unit, National Oncology Center, Royal Hospital, Muscat, Sultanate of Oman.

ABSTRACT
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.

No MeSH data available.