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Commissioning of Virtual Simulation THE SOUTH AFRICAN RADIOGRAPHER volume 55 number 1 | MAY 2017 peer reviewed ORIGINAL ARTICLE Commissioning of virtual simulation and its role in the treatment planning of sixty-three (63) head and neck cancer patients – the Charlotte Maxeke Johannesburg Academic Hospital (CMJAH) experience B Van Wyk1 MSc | T Nyathi1 PhD | LP Masamba2 MMed | V Sharma2 PhD 1 Department of Radiation Sciences, Division of Medical Physics, Charlotte Maxeke Johannesburg Academic Hospital, South Africa 2 Department of Radiation Sciences, Division of Radiation Oncology, Charlotte Maxeke Johannesburg Academic Hospital, South Africa Abstract The objective of this paper is to share the experience of commissioning the virtual simulation (VSim) software, GE Advantage Sim ver 4.3, and its use in the radiation therapy of head and neck cancers at Charlotte Maxeke Johannesburg Academic Hospital (CM- JAH). The first sixty-three (63) head and neck cases, planned on the VSim workstation, were retrospectively analysed, as well as the impression of staff members after using the system. A semi-structured survey revealed that members of the multi-disciplinary team were overall satisfied with the system. A follow-up study, with more cases and other treatment sites, will be conducted to confirm these findings. Keywords radiation therapy, computed tomography, bone necrosis, dental reviews Introduction planning by means of bony-land marks Erlangen, Germany), one 3 channel Nu- on a conventional simulator; and three cletron high dose rate brachytherapy Head and neck cancers are one of the dimensional (3D) planning by means of afterloader (Elekta AB, Sweden Stock- most troublesome cancer groups, with computed tomography (CT), which pro- holm), one 24 channel GammaMedplus 60% of them presenting at locally ad- vides information, not only about target high dose rate brachytherapy afterloader vanced stages; local regional recurrence volumes but also about critical (normal) (Varian Medical Systems, Palo Alto, CA) constitutes the predominant recurrent organs. Simulation ’mimics’ the actual and one DX3300 orthovoltage X-ray unit [1] pattern. Radiotherapy is a standard non- radiation treatment. It therefore forms an (Gulmay Medical Ltd., Surrey, United surgical therapy for locally advanced head integral part of the treatment planning of Kingdom), and LANTIS® (Elekta AB, and neck cancers. These cancers account head and neck cancers. Virtual simulation Stockholm, Sweden) as the record and for approximately 10% of the 3000 cancer (VSim) is a multidimensional planning verify system. cases treated at the Charlotte Maxeke Jo- technique based on CT images, which hannesburg Academic Hospital (CMJAH). “provides the user with an accurate repro- Patients presenting at CMJAH, like in Eighty percent of these cases present in duction of anatomical features from the most South African university teaching advanced stages. In 1998/1999 head and viewpoint of the treatment source”.[5] The hospitals, are most likely to experience neck cancer constituted approximately virtual simulation workstation at CMJAH long waiting times before they receive 4% of all cancer cases treated in South does not incorporate a 3D dose algorithm radiotherapy. It was therefore envisaged Africa.[2] as it cannot calculate dose and optimise a that the introduction of VSim would re- plan. It is thus described as two and half- lieve the workload on the conventional In order to maximise the chances of cure, dimensional (2.5D) planning at CMJAH. simulators and consequently potentially while at the same time minimising com- reduce the patient waiting list. This paper plication rates, radiotherapy, for head CMJAH radiation oncology is a multi- provides our experience, and results, for and neck cancer, aims to administer high vendor environment with the following the commissioning and utilisation of the radiation doses to target volumes, whilst equipment: four Siemens Oncor™ linear VSim system at CMJAH for head and neck sparing critical structures like the mucous accelerators (LINACS) (Siemens Medical cancer radiotherapy during the period membranes, spinal-cord, parotid glands, Solutions, Concord, CA), two Equinox from 1 March to 30 November 2008. etc. To prevent tooth decay, and the risk of Cobalt-60 units (MDS Nordion, Canada), subsequent bone necrosis, dental reviews two Toshiba simulators (Toshiba, Japan), Methods and materials are crucial before commencing irradia- Helax_TMS ver. 6.1B (Philips Medical tion of head and neck tumours.[3,4] Treat- Systems, Fitchburg, WI) treatment plan- The VSim workstation underwent com- ment planning is an essential component ning system (TPS), Oncentra MasterPlan prehensive customer acceptance testing for radiation therapy, especially in cura- (Nucletron, Columbia, United States of (CAT) as per the vendor’s customer accept- tive treatments where doses up to 70Gy America) TPS, one General Electric (GE) ance testing procedure.[6-8] In addition, may be delivered to the primary site. Ra- Lightspeed computed tomography unit end-to-end testing, utilising a purposefully diotherapy treatment planning includes: (GE, Erlangen, Germany), virtual simu- non-symmetric phantom, was performed hand planning by means of a single lation (VSim) workstation with the GE to establish the fidelity of the data transfer patient contour; two-dimensional (2D) Advantage Sim ver. 4.3 software (GE, from the CT scanner to the VSim worksta- 14 www.sorsa.org.za MAY 2017 | volume 55 number 1 THE SOUTH AFRICAN RADIOGRAPHER tion and to the treatment delivery LINAC through the record and verify system. Soft- ware functionalities, which were common between the VSim workstation and the TPS, were compared; the TPS being the reference. A common image dataset was used in both TPS and VSim. Functionali- ties that were tested, and compared, in- cluded contour volumes, and dimension measurement. To ensure non-drift in the performance of the VSim system, an ongo- ing quality control programme, informed by the prevailing workflow, was designed and implemented.[9] The first 63 head and neck cases planned Figure 1: CMJAH VSim workflow on the VSim system (from 1 March to 30 November 2008) were used in this study. The data collected was not gender specific as this would not have added any value to this study. Also there were no inclusion/ exclusion criteria used for this study. The head and neck cancer cases that were planned, using VSim, were radical (cura- tive intent) for doses ranging from 66 Gy to 70Gy. The treatment technique used was two lateral and two offcord fields, a matching anterior neck field, and two pos- terior neck electron fields. To gauge the acceptance of the VSim system by the users, a survey was con- ducted by means of a semi-structured in- terview. Six radiation oncologist and eight radiotherapists participated in the survey. The participants were arbitrarily chosen from those who had already used the VSim system. The participants were asked the following questions. Figure 2: Head and neck immobilisation mask • Is there a role for virtual simulation at CMJAH? • What are the ’negatives’ of the tech- nique/workflow? • What are the ’positives’ of the tech- nique/workflow? • What is your overall impression of the virtual simulation technique as used at CMJAH? Results The CAT was successfully completed, with all the purchased software licences func- tioning correctly, including back-up and archiving capabilities. To complement the CAT, a collection of photon and electron beams, of different geometry combina- tions including asymmetric fields, was planned on the VSim system and trans- ferred to LANTIS® for subsequent delivery on the LINAC. Upon downloading the VSim created fields on the LINAC, visual Figure 3: Head and neck immobilisation www.sorsa.org.za 15 THE SOUTH AFRICAN RADIOGRAPHER volume 55 number 1 | MAY 2017 Table 1: Head and neck VSim protocol at CMJAH SITE Immobilisation Patient POSITIONING CT scan protocol SLICE ThICkNESS Scan LIMIT Head and neck - Perspex Mask Supine Head and neck 5 mm Vertex to below supra - ± Tongue depressor sternal notch - Head rest - ± Bite block - Radical head and neck board calculated based on the treatment plan. On the first day of treatment, the patient is positioned to the initial reference marks and then shifted to the treatment isocenter using the calculated shifts. The distribution by treatment site of the head and neck cancers during the first nine months of the utilisation of the VSim system is demonstrated in Figure 4. The survey revealed that the majority of oncologists (five out of six) and radio- therapists (six out of eight) demonstrated positive attitudes with regard to the use of VSim at CMAJH. The radiation oncologists highlighted the disadvantages of the shift method, namely, the inability to modify Figure 4: Distribution by specific treatment site of first 63 head and neck cases who under- slice thickness; their preferred head posi- went virtual simulation tion of the patient, etc. after the scan is taken by the radiotherapist. The radio- inspection of the field geometry and ma- Head and neck cases are immobilised therapists were of the opinion that the use using individualised Perspex shells (masks) chine parameters (e.g. gantry angle, col- of the conventional simulator in the treat- to prevent patient movement during treat- limator angle, couch angle, etc.) was ment technique of VSim was additional ment and to ensure accurate reproducibil- done to confirm data transfer fidelity. The work. results of these tests proved consistency ity in the treatment set-up. Figure
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