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Design and Study of In-House Gantry Couch Anti-Collision Device for External Bam Radiotherapy Machines

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S Senthilkumar

S Senthilkumar1*, S Karthik2, (1) Madurai Medical College & Govt. Rajaji Hospital, Madurai, TAMILNADU,India (2) Bharathidasan University, Trichy, TAMILNADU

SU-E-J-202 Sunday 3:00PM - 6:00PM Room: Exhibit Hall

Purpose: The main purpose of this study was to develop a low cost in-house anti-collision device for external radiotherapy machines. All radiotherapy machines have moving parts, needs some safety measures to maintain the accuracy and safety of the patients. The moving parts of radiotherapy machines may cause collision between the treatment head and the table, which affects the machine accuracy and sometimes a replacement of affected parts. If a patient interferes, it results in severe injuries. So, every radiotherapy machine should have a safety feature to overcome the problem of collision.

Methods: The anti-collision device consists of an IR(infrared) emitter, an IR receiver, an Acrylic holding device, a magnetic support, computer based micro controller circuits, a threshold selector, an LCD display, an LED light source and an alarming device. This device is fixed in the lower surface of the gantry head. The threshold distance can be varied when adjusting the threshold selector. When the fixed pre threshold limit is exceeded, the LED will glow; at the same time the alarming device produces sound. On hearing the sound the technologist can stop the movement of the machine. If the output device is connected with the RT machine, the device can stop the movement automatically when the fixed pre threshold limit is exceeded.

Results : We used this device to monitor the movement during the radiotherapy using phantoms and patients. Our method correctly confirmed clearance between the patient/treatment table and the gantry. This device is easy to handle, inexpensive, alert the radiation technologist as well as it stops the machine movement when the gantry and the couch come nearer to each other. Anti-collision device improves the performance of the machine and most importantly reduces the chance of collision.

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