Immobilizations devices

Present.- Ambuj kumar, BMTR 2nd year 2010-13 batch.

Support.- Akhil chaudhary,BMTR, 2nd year 2010-13

Moderat.- MR. Randeep Singh Bedi, seniour RTT at RGCI & RC , Faculty BMTR GGSIPU.

Definition Devices used to lock the patient’s target anatomy to

restrict the movement of that site (within limit) for precise dose delivery which leads to achieve our goals which is fire maximum dose on target and possibly minimum dose to normal tissues.

why ? increase target accuracy easy to use quick to set up comfortable for the patient durable enough to withstand an entire course of treatment increase patient throughput reimbursable under complex treatment device

Aim • Although the primary goal of immobilization system is

to limit patient motion and reduce the probability of major positioning errors, there are other benefits as well.

• A well constructed immobilizing system can reduce the time for daily patient set up.

• It can make the patient feel more secure and less apprehensive.

• It can reduce the reliance on patient co-operation and alertness, and it can help to stabilize the relationship between external skin marks and internal structures.

History sand bags tape bite block plaster casts “home-made devices”

Considerations for selecting a device

cost convenience accuracy speed compatibility attenuation durability

FRAME BASED

frameless

Immobilization devices• Orfit cast• Vac lok• Velcro Straps • Alfa cradle• Pituitary board• Breast board• Customized foam pads• Wing board• Indexing bar

Positioning & support devices• AIO• Base plate• Thorax positioning board• Belly board• Leg rest• Knee rest• Grip poles• Head supports• Hand protudrance• Prone pillow• Prone head support

Errors Localization Error

results from the failure to appreciate the full extent of the disease or to design adequate treatment fields

Immobilization Error occurs as a result of displacement of the treatment fields

relative to the intended treatment volume