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Monte Carlo accuracy and ProSoma efficiency for busy CTsim and planning departments
If your plan and MU check workload are high, or your expensive planning workstations are overloaded, and you value the highest level of dose accuracy – ProSoma® Core will provide a practical and very cost-effective option for your clinical department.
Available as an upgrade to ProSoma v-sim, or as a standalone independent system to complement existing planning and dose check systems. Either way, ProSoma Core will bring streamlined workflows that will save money in not having to purchase additional expensive planning workstations or other plan check software.
Using an established Monte Carlo model means you will have the most accurate method of dose calc compared to existing planning systems. With minimal beam commissioning, beam models provided and an optional beam commissioning service from OSL, you can be up and running in a few days from installation.
For all static beam techniques, such as palliative, POPs and breast planning, ProSoma Core performs a primary calculation of MUs and dose in 3D and can dramatically reduce overall time taken as clinicians can simulate and then instantly approve and sign off plans / calcs resulting in an efficient, single step process from simulation - calc – approval – sign off. Add no more than 1 minute to your existing simulation procedure.
Interactive: MC engine vs TPS
Complex plans such as IMRT, VMAT, stereotactic, can be calculated on 3D anatomy by the Monte Carlo dose engine providing the highest-level accuracy secondary plan and MU check. Interactively check plan results in 3D patient anatomy. As a Monte Carlo model, it provides definitive answers to non-measurable difficult areas such as head and neck and chest regions that are superior to older TPS algorithms such as collapsed cone.
Not only is ProSoma Core a plan check system, but it also calculates the actual dose delivered by the treatment machine on any day, showing the effect of the delivery on the patient’s treatment. It provides extensive analyses and a verification report of dose differences and errors.
ProSoma can automate adaptive dose re-calculation using daily cone beam CT data (CBCT) brought together with the planning CT and RT data to perform deformable image registration of the two CTs and transfer the RT Structure Set and RT Plan onto the deformed planning CT. It will then calculate the new dose distribution on that CT. DVHs and various dose parameters will be calculated automatically taking into account the current patient anatomy. As a result of those calculations, a pdf report will be generated and be available for review in ProSoma or via the ProSoma Web Portal.
All calculations are performed and reviewed in 3D, and notifications of results can be sent via e-mail for efficient task management.
The machine log file analysis provides QA of another source of potential error in radiotherapy: It checks if actual machine parameters during treatment delivery match planned machine parameters in the RT Plan. For this purpose, ProSoma Core can read machine log files from Varian and Elekta linacs which contain physical machine parameters recorded during treatment and then compares the resulting fluence images or 3D dose distributions to the fluences or doses resulting from the RT Plan. Parameters found in machine log files include dose rate, gantry and collimator angle, jaw and MLC positions. The idea behind ProSoma Core’s machine log file analysis is to detect if new log files have been written by the treatment machine and then automatically trigger recalculations using those files and the respective CT and RT data.
The 3D dose computed from log file data may now be compared either to the TPS dose or to the ProSoma Core computed MC reference dose on the planning CT. In this way, it is possible to isolate the differences resulting from log file deviations and ignore differences resulting from different calculation algorithms.
Here, at Southend University Hospital, we use Prosoma as a starting point in the Radiotherapy Treatment Planning pathway. Once the patients have had their CT scan, the images are exported to Prosoma. All our contouring is done using Prosoma. We utilise features in Prosoma such as the auto contouring and model functions. These are particularly useful when outlining the organs at risk, allowing us to speed up the contouring process.
Furthermore, to aid the Oncologists during delineation, we often use the image fusion tab within Prosoma: where another imaging modality is imported and fused with the planning CT scan. Within the image fusion tab, we regularly use the auto fusion function to help when aligning the two scans.
Another feature of Prosoma that Southend Hospital benefits from is the use of scripts. This function is helpful and time saving for the treatment planner in creating margins for the Planning organ at Risk Volumes (PRV), especially when there are multiple volumes to create.
We also have recently started using Prosoma to analyse the dose distribution during Oncologist plan approval. The Oncologists find the dose evaluation module in Prosoma very helpful as they are able to access Prosoma remotely through Citrix and view the plan when they are off-site.
Overall, during the Treatment Planning pathway, we find Prosoma speeds up our workflow, from the auto contouring features to the use of scripts. Also, Prosoma has provided us with the platform for remote access Oncologist plan approval of the treatment plan. All of our Prosoma users find the software easy to use and navigate around.
R Cunningham, Pre Reg Clinical Scientist
We have been using ProSoma for contouring, image registration and unplanned workflows for a number of years. The recent addition of the “Core” module has benefited our treatment planning workflows by automating secondary dose calculation and providing full 3D dose calculations where we’ve previously relied on a single point dose calculation. The Monte Carlo algorithm works quickly (<2 minutes for a full patient dose calculation at 3mm voxel size and 1% uncertainty) giving excellent agreement with the Monaco treatment planning system (>98% gamma values at 3%, 2mm). Beam modelling can be difficult but the team at MedCom responded when we had questions or needed adjustments. We’ve saved a significant amount of time and energy per plan check and have quickly become used to a slick and efficient process.
Jim Daniel, Head of Treatment Planning & Brachytherapy
The physical distancing requirements associated with Covid-19 necessitated relocating staff to any available space within the department. The temporary site-wide licence has been very beneficial, as it has allowed us to run ProSoma from anywhere without having to think about whether licences are in use. My thanks to all at OSL for thinking of it.
Conor Heeney, Head of Radiotherapy Physics
I can’t thank OSL enough for the fantastic generosity shown in granting us the site licences for a short period in these very difficult times. This has allowed clinicians and physics staff to use Prosoma remotely from home.
Tervinder Matharu
Implementing ProSoma Core brochure
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