School of Health Sciences

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Browsing School of Health Sciences by Author "Rasul, Shahid"

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    Dosimetric effect of limited aperture multileaf collimator on VMAT plan quality: A study of prostate and head-and-neck cancers
    (Reports of Practical Oncology and Radiotherapy, 2018-02-16) Murtaza, Ghulam; Mehmood, Shahid; Rasul, Shahid; Murtaza, Imran; Ehsan ullah Khan
    The aim of study was to evaluate the dosimetric effect of collimator-rotation on VMAT plan quality, when using limited aperture multileaf collimator of Elekta Beam Modulator™ providing a maximum aperture of 21 cm × 16 cm. Background The increased use of VMAT technique to deliver IMRT from conventional to very specialized treatments present a challenge in plan optimization. In this study VMAT plans were optimized for prostate and head and neck cancers using Elekta Beam-ModulatorTM, whereas previous studies were reported for conventional Linac aperture. Materials and methods VMAT plans for nine of each prostate and head-and-neck cancer patients were produced using the 6 MV photon beam for Elekta-SynergyS® Linac using Pinnacle3 treatment planning system. Single arc, dual arc and two combined independent-single arcs were optimized for collimator angles (C) 0°, 90° and 0°–90° (0°–90°; i.e. the first-arc was assigned C0° and second-arc was assigned C90°). A treatment plan comparison was performed among C0°, C90° and C(0°–90°) for single-arc dual-arc and two independent-single-arcs VMAT techniques to evaluate the influence of extreme collimator rotations (C0° and 90°) on VMAT plan quality. Plan evaluation criteria included the target coverage, conformity index, homogeneity index and doses to organs at risk. A ‘two-sided student t-test’ (p ≤ 0.05) was used to determine if there was a significant difference in dose volume indices of plans. Results For both prostate and head-and-neck, plan quality at collimator angles C0° and C(0°–90°) was clinically acceptable for all VMAT-techniques, except SA for head-and-neck. Poorer target coverage, higher normal tissue doses and significant p-values were observed for collimator angle 90° when compared with C0° and C(0°–90°). Conclusions A collimator rotation of 0° provided significantly better target coverage and sparing of organs-at-risk than a collimator rotation of 90° for all VMAT techniques.
At the School of Health Sciences [SHS], University of Management & Technology, we are preparing the next generation of exceptional leaders in health care. We are achieving this by embracing a spirit of inquiry and innovation in education and research in all of our academic programs. At SHS, we use interdisciplinary approach, innovative and technology-driven teaching methodology and world class clinical and lab facilities to provide our students an amazing learning experience. A low student-to-faculty ratio helps to ensure that students achieve academic success within a rigorous and supportive environment. The students are immersed in multidisciplinary, collaborative model of study early and experience hands-on real-life environment right from the beginning of their course work. SHS offers a wide range of Undergraduate and Graduate programs in health sciences across a wide spectrum of fields. Presently, programs in Physiotherapy, Biomedical Laboratory Sciences, Health Management, Public Health, Imaging & Radiation Sciences, Ultrasonography and Nutrition Sciences are being offered. At SHS, we aim to develop highly skilled and compassionate professionals in their chosen careers who aspire to the highest standards of professional integrity and ethics. Apart from teaching, we also perform other main functions as part of the University of Management and Technology. These include: Identifying new and emerging areas in the field of medicine and health sciences. Planning and development of new academic modules and degree programmes according to the identified need. Planning and Development of world-class healthcare facilities such as Physical Medicine & Rehabilitation Centres, Tertiary-level Diagnostic Laboratory and Radiological Service Centres. Serving as a resource centre and knowledge base in the area of public health, preventive care, nutrition, and disease prevention. Undertaking research on important and pressing health issues facing Pakistan. Developing effective and implementable policy tools and interventions to address important health issues at the country, regional and global level. Development of a Tertiary-Level Teaching University Hospital and affiliated medical school at UMT. With state-of-the-art clinical skills facilities, the School of Health Sciences is a place where students, academics and practitioners come to learn, share and develop their skills.