ProSoma simulation

Every ProSoma workstation/license includes a vast range of clinical functions, including the geometric simulation of external radiotherapy beams. Suitable for every type of treatment machine and radiotherapy technique with powerful imaging - this is the heart of the ProSoma software.

Modelling the machine

The very first consideration for virtual simulation is on which treatment machine and in which way will I treat this patient?

ProSoma models all the commercial treatment machines, and even if your radiation oncology department has some strange unheard of machine lurking in a treatment room, it is simple to edit the standard linac treatment machine files to create your own machine in minutes. This can also be an excellent training exercise for physicists and radiographers. All makes of MLC both standard and micro are also fully modelled.

Beam libraries for beam arrangement that are regularly applied, ProSoma can store a set-up and rapidly apply multiple beams in seconds. This can make light work of four field bricks, five - seven field IMRT fields. Asymmetric half beam blocked fields for head and neck patients is effortless. Once applied, all beams can be repositioned en masse by an interactive mouse movement of this isocentre.

Imaging - bringing the virtual patient to life

When moving from 'real' simulation to 'virtual' simulation, the biggest problem faced is the confidence in knowing that the virtual patient set-up will be as accurate as the real thing. ProSoma has many tools to make sure the virtual patient set-up will be as accurate as the real thing. ProSoma has many tools to make the virtual patient accurate and life-like.

Surface observer-eye-view images with a virtual light field help achieve this. The projected light field accurately re-creates the divergent beam, so that even areas of 'splash' beyond the patient are seen. For the first time, it is also possible to visualise the exit beam in relation to the patient surface. Many more tools such as surface rulers, image mixing etc. aid the setting up and verification on the treatment unit.

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DRRs or digitally reconstructed radiographs are the mainstay of any virtual simulation software. ProSoma has a library of image presets that quickly allow you to change from soft tissues to dense tissues, to bony anatomy to skin surface. For treatment machine verification the DRR can be changed to look like a megavoltage portal image and then exported to the EPID comparison.

From simple palliation to complex radical

When you are short of time, have a patient in discomfort on the couch, the ease and speed with which a plan can be simulated and exported to the treament machine is critical. ProSoma excels in its ability to quickly apply beams either direct on the CT images, direct on the DRR, or even directly onto the skin surface view where any surface markers such as on a painful vertebra, a node or scar, can be visualised with the light field.

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Image 1: Light field on thermoplastic shell

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Image 2: Shell virtually removed to show light on skin

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Image 3: Light field direct onto skull

This page was printed from OSL Web site at http://www.osl.uk.com