To analyze the dose absorption patterns of 6 Megavoltage (MV) photon beam using computed tomography (CT) slices thorax patient, slab phantom, and slab–kailwood–slab phantom. Single MV with field size 10 × cm 2 was put on CT images chest wall, phantom perpendicular to surface. Dose calculated anisotropic analytical algorithm. Densities each medium were by Hounsfield units measured from medium. The depths isodose curves 100%, 95%, 90%, 85%, 80%, 70%, 60%, 50% in all three mediums. densities...

Abstract Background For chest wall irradiation in breast cancer patients, three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated (IMRT) have made tremendous changes treatment delivery. Purpose The purpose of this study is to compare the dosimetric parameters IMRT 3DCRT plans. Materials methods plans were generated for 25 randomly selected postmastectomy patients. prescribed dose (PD) was 50 Gray (Gy) fractions (#) at rate 2 Gy/# with 5#/week. Dose volume histogram evaluated...

Dosimetric comparison between intensity modulated radiotherapy and three dimensional conformal planning in patients with locally advanced cervical carcinoma

Background: Craniospinal irradiation (CSI) of medulloblastoma poses technological challenges due to the involvement large treatment volume. Commonly, whole length is covered with two different isocentric plans in which junction shifted after every five fractions overcome possibility hot and cold spot.Objective: This study aims evaluate dosimetrically clinically innovative planning technique for CSI doesn’t need re-planning re-setup patients fractions.Material Methods: Computed tomography was...

Phantoms are the devices which have been used in medical physics since beginning. Soon after discovery of x-rays physicist develop phantoms for diagnostic as well dosimetric purpose. Earlier it was thought that order to quantify dose delivered a tissue interest; measurement should be made on itself. When harmful effects radiation were realized, need substitute became clear, and thus concept phantom came picture. As human body consists almost 60 percent water is done homogeneous equivalent....

Quality assurance (QA) before patient treatment plays a major role in complex radiotherapy (RT) planning. Phantoms are the standard materials that used for pre-treatment QA of patients. Contemporary phantoms RT mainly water-based, having simple geometry and uniform density. These dose not replicate exact heterogeneities actual human body. The present work aims to evaluate results relative dosimetry performed on in-house developed heterogeneous thorax phantom (HTP) using an electronic portal...

Introduction: The determination of accurate dose distribution is an issue fundamental importance in radiotherapy, especially with regard to the fact that human body a heterogeneous medium. Therefore, present study aimed analyze density and isodose depth profiles 6 MV beam SP34 slab-wooden dust (pine)-SP34 slab (SWS) phantom.  Materials Methods: slab, wooden pine, thoracic region 10 patients were calculated using computed tomography (CT) images. depths lines measured for on CT images chest,...

Craniospinal irradiation (CSI) of medulloblastoma poses technological challenges due to the involvement large treatment volume. Commonly, whole length is covered with two different isocentric plans in which junction shifted after every five fractions overcome possibility hot and cold spot.This study aims evaluate dosimetrically clinically innovative planning technique for CSI doesn't need re-planning re-setup patients fractions.Computed tomography was done fifteen (ten children adults)...

Aim: The aim of the present study was to evaluate impact magnetic resonance imaging (MRI) on radiotherapy target volume changes in prostate cancer. Materials and Methods: Ten patients with localized cancer receiving radical were included study. Computerized tomography (CT) simulation done adequate immobilization, pelvic MRI also at same time. two then registered eclipse planning system fused. Target delineation (gross tumor [GTV] clinical [CTV]) both image sets separately their volumes...

Purpose: The purpose of this study is to analyze and compare the dosimetric parameters three dimensional conformal radiotherapy (3DCRT) intensity modulated (IMRT) in selected non-small cell lung cancer (NSCLC) cases. Methods: Ten patients with inoperable NSCLC were for study. 3DCRT IMRT plans generated all following Radiation Therapy Oncology Group (RTOG) guidelines. Generated then compared on basis planning target volume (PTV) coverage, dose delivered organs at risk, homogeneity index (HI),...

The success of radiotherapy depends on precise treatment simulation and proper patient positioning. simulator is a conventional radiographic fluoroscopic system which emulates the geometrical positions unit. Hence, acceptance tests quality assurance (QA) are important prior to its commissioning for safe clinical use. verification mechanical optical readouts, field size, isocenter, radiation congruence were performed. X-ray beam parameters tested kVp , mAs consistency output. flat panel...

Purpose: Various factors cause geometric uncertainties during prostate radiotherapy, including interfractional and intrafractional patient motions, organ motion, daily setup errors. This may lead to increased normal tissue complications when a high dose the is administered. More-accurate treatment delivery possible with imaging localization of prostate. study aims measure shift by using kilovoltage (kV) cone beam computed tomography (CBCT) after position verification kV orthogonal portal...

The aim of this study was to compare the dosimetric parameters Co-planar Intensity modulated radiotherapy (C-IMRT), non-coplanar (NC-IMRT), and volumetric arc therapy (VMAT) planning technique in hippocampal sparing (HS) whole brain (WBRT). Fifteen patients metastasis (BM) treated with whole-brain palliative radiation were selected for study. C-IMRT, NC-IMRT VMAT plans generated comparison. Generated evaluated based on target volume (PTV) coverage, conformity index (CI), homogeneity (HI),...

Introduction: Dose validation inside the human body needs a medium which can simulate actual heterogeneities of specific site. The aim present work is to study properties cost-effective heterogeneous thorax phantom (HTP) developed in-house by author and its application for evaluation patient-specific absolute point dosimetry employing analytic anisotropic algorithm (AAA) Acuros XB (AXB) algorithm. Materials Methods: HTP was made from dust porous pinewood, rib cage, honeybee's wax. Density...

To perform patient-specific quality assurance (QA), the accuracy of dose calculation algorithm is vital, especially in lung cancer stereotactic body radiation therapy (SBRT). The present study based on evaluation two widely used algorithms, analytical anisotropic (AAA) and Acuros XB (AXB) inside in-house developed heterogeneous thorax phantom (HTP) a homogeneous slab (HSP) simultaneously. evaluate dosimetric differences between point measurement was performed for pretreatment QA plans 35...