Design and Implementation of a Multipurpose Phantom for Advanced Radiotherapy Treatment Delivery Verification
Introduction: Radiotherapy alone or in conjunction with surgery or chemotherapy is one of the principal modality for the treatment of cancer by using ionizing radiation. Achievement of higher tumor control probability with reduced treatment morbidity is the ultimate goal of radiotherapy and in order...
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| Format: | Article |
| Language: | English |
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Sonali Sharma on behalf of Rajasthan University of Health Sciences
2023-09-01
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| Series: | RUHS Journal of Health Sciences |
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| Online Access: | https://ruhsjhs.in/articleDetails.php?artid=TVRRMg== |
| Summary: | Introduction: Radiotherapy alone or in conjunction with surgery or chemotherapy is one of the principal modality for the treatment of cancer by using ionizing radiation. Achievement of higher tumor control probability with reduced treatment morbidity is the ultimate goal of radiotherapy and in order to successfully achieve this, intensive dosimetry is necessary during the implementation of the technique and treatment verification processes. Methodology: Computed tomography (CT) images were obtained as per normal departmental protocols. The external outline, target volume, femoral heads, bladder, and rectum were delineated using the Eclipse planning system. Each organ and bone structure for each individual slice was milled using a Pinnacle milling machine. Moulds were created using external contour for the organs; liquid material was poured into the moulds and allowed to cure, forming solid organs in close contact to remaining structures. A Scanditronix Wellhofer CC01 chamber was chosen for absolute dose measurement protocols. A water fillable applicator holder was made to use the intra-cavitary brachytherapy applicators. The phantom slices were determined along transverse planes. To facilitate a high level of reproducibility, the phantom design incorporated two positioning rods passing through each slice. Results: The phantom was simple to assemble and reproducible with no discernible displacement. The CT numbers of the phantom materials and those of the delineated regions on the CT of the patient used to model the phantom were sampled using the Eclipse planning system and indicates agreement. The doses measured with the ionization chamber and Thermoluminescent Dosineter (TLDs) were compared with Treatment Planning Systems (TPS) calculated dose in different locations in the phantom like target volume, bladder, rectum, left, and right femoral head. The average measured dose agreed with the TPS calculated dose for both teletherapy and brachytherapy treatment plans. |
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| ISSN: | 2456-8309 2582-3590 |