A5048302668- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Medical Imaging Techniques and Applications
- Advances in Oncology and Radiotherapy
- Glioma Diagnosis and Treatment
- Radiation Effects and Dosimetry
- Breast Cancer Treatment Studies
- Radiation Detection and Scintillator Technologies
- Lung Cancer Diagnosis and Treatment
- Brain Metastases and Treatment
- Nuclear Physics and Applications
- Advanced X-ray and CT Imaging
- Head and Neck Cancer Studies
- Prostate Cancer Diagnosis and Treatment
- Thyroid Cancer Diagnosis and Treatment
- Ultrasound in Clinical Applications
- Radiomics and Machine Learning in Medical Imaging
- Effects of Radiation Exposure
- Spinal Dysraphism and Malformations
- Radiation Shielding Materials Analysis
- Pulsed Power Technology Applications
- BRCA gene mutations in cancer
- Management of metastatic bone disease
- Cutaneous lymphoproliferative disorders research
Cairo University
2015-2024
Children Cancer Hospital
2008-2020
Cancer Institute (WIA)
2017-2020
National Cancer Institute
2013
Access to high quality radiotherapy (RT) continues be a major issue across Africa with having just 34% of its optimal capacity.We co-developed survey clinical, academic and policy stakeholders designed provide structured assessment the barriers enablers RT capacity building in Africa. The covered nine key themes including funding, procurement, education training. was sent professionals 28 countries responses underwent qualitative quantitative assessment.We received completed questionnaires...
Objective: The aim of This work to provide evaluation for the out-of-field dose with different plan parameters as field size and depth using Markus ionization chamber detector in measurement that are frequently used electron superficial dosimetery, radiotherapy. Methods: is carried out through application these estimation important dosimetric such (from 5×5 30×30 cm2) 1.5 30 cm) at energy 6 MV collimator angle 0° SSD 100 cm. Results: Results show that, reported an increase size, almost all...
The improvement in conformal radiotherapy techniques enables us to achieve steep dose gradients around the target which allows delivery of higher doses a tumor volume while maintaining sparing surrounding normal tissue. One reasons for this was implementation intensity-modulated radio therapy (IMRT) by using linear accelerators fitted with multi-leaf collimator (MLC), Tomo and Rapid arc. In situation, verification patient set-up evaluation internal organ motion just prior radiation become...
To evaluate set-up variation of pediatric patients undergoing 3D conformal radiotherapy (3DCRT) using electronic portal image device (EPID), in an effort to the adequacy planning target volume (PTV) margin employed for 3DCRT treatment patients.Set-up data was collected from 48 treated with 3DCRTfor head and neck (31 patients), abdomino-pelvic (9 patients) chest (8 sites during period between September 2008 February 2009. A total 358 images obtained by EPID were analyzed. The mean (M)...
This work aimed at evaluating the performance of three different intensity-modulated radiotherapy (IMRT) treatment planning systems (TPSs)--KonRad, XiO and Prowess--for selected pediatric cases. For this study, 11 patients with types brain, orbit, head neck cancer were selected. Clinical step-and-shoot IMRT plans designed for delivery on a Siemens ONCOR accelerator 82-leaf multileaf collimators (MLCs). Plans optimized to achieve same clinical objectives by applying beam energy number...
Purpose: To evaluate the agreement between measured and calculated doses for head neck tumors using different gamma criteria to establish quality assurance protocol delivery of IMRT in The National Cancer Institute Cairo. Methods : dose is 30 patients CMS Treatment Planning System. ionization chamber (0.6 cm 3 Farmer type) used point measurements. 2D-array (PTW 729) GafChromic films (EBT2) are 2D graphical distribution. Four difference (DD) distance (DTA) (3%/3 mm, 3%/5 4%/4 mm 5%/5 DD /...
This work focusses on the estimation of induced photoneutrons energy, fluence, and strength using nuclear track detector (NTD) (CR-39). Photoneutron energy was estimated for three different linear accelerators, LINACs as an example commonly used accelerators. For high-energy neutrons are produced a consequence photonuclear reactions in target nuclei, accelerator head, field-flattening filters beam collimators, other irradiated objects. NTD (CR-39) is to evaluate fluence fast neutron. Track...
Hypofractionated radiotherapy (HFRT) in breast cancer treatment regimen (40 Grey /15 fractions/3 weeks) is more convenient for patients, especially those coming from remote areas to facilities and healthcare providers, than conventional fractionation (50 Gy/25 fractions/5weeks). So the effectof interruption on outcome (loco-regional control (LRC)& overall survival (OS)) during hypofractionated schedule issue of our study.Materials Methods: We studied retrospectively 174 female patients...
Abstract Introduction There is a growing interest in the study of radiation‐induced secondary cancer. The aim this work (i) to estimate peripheral doses attributable intensity modulated radiotherapy ( IMRT ) and mega‐voltage cone beam computed tomography MV ‐ CBCT for some organs at risk OAR s) which surround target being treated (Nasopharynx) paediatric patients. (ii) To cancers patient setup verification imaging dose using Nasopharyngeal Carcinoma NPC patients comparing it with that...
Recently, paediatric cardiac computed tomography (CCT) has caused concerns that diagnostic image quality and dose reduction may require further improvement. Consequently, this study aimed to establish institutional (local) reference levels (LDRLs) for CCT patients, assess the impact of tube voltage on proposed DRLs in terms volume index (CTDIvol) length product (DLP). In addition, effective doses (EDs) exposure were estimated. A population 453 infants, whose mass age less than 12 kg 2 years,...
Abstract Background This work aims to compare the dosimetric performance of three-dimensional conformal radiotherapy (3D-CRT), a relatively available technique in developing countries, intensity-modulated (IMRT) treatment different stages nasopharyngeal carcinoma (NPC). Materials and Methods According diagnostic stages, 40 NPC patients were divided into two equal groups. Three planning techniques such as 3D-CRT, seven-field IMRT (7F-IMRT) nine-field (9F-IMRT) compared. Dose prescriptions 70...
Craniospinal irradiation (CSI) is the standard radiation therapy treatment for medulloblastoma. The aim of this study was to estimate and compare lifetime risk radiation-induced secondary cancer in pediatric medulloblastoma patients using three-dimensional conformal radiotherapy (3D-CRT) intensity-modulated (IMRT).3D-CRT IMRT plans were performed 10 CSI patients. average absorbed doses organs at (OARs) calculated from dose-volume histograms on planning system. then calculated.Lifetime...
Purpose: To compare target dose distribution and to normal tissue for brain tumors using intensity-modulated three-dimensional conformal radiotherapy. Methods Materials: Twelve patients selected in the present study compared dosimetry of radiation therapy (IMRT) (3DCRT) techniques treated with different diagnosis tumor. All underwent computed tomography planning conjunction magnetic resonance imaging fusion. Prescription normal-tissue constraints were identical both plans. The tolerance...
Influence of distinct radiotherapy techniques to induce second cancer risks in left breast cancer. Material and methods: Ten female patients with intact Two treatment plans for each patient: 1) two tangential beams 3D-Conformal radiotherapy, 2) intensity-modulated (IMRT) plan. Estimation risk from Organ equivalent dose models (OEDs) three dose-response model organs at cases. Results: The P-value OED 3D-IMRT lung, both heart, right breast, thyroid, liver spinal cord linear was 0.016, 0.005,...
This work aimed at evaluating the effect of 6- and 10-MV photon energies on intensity-modulated radiation therapy (IMRT) treatment plan outcome in different selected diagnostic cases. For such purpose, 19 patients, with types non CNS solid tumers, were selected. Clinical step-and-shoot IMRT plans designed for delivery a Siemens Oncor accelerator 82 leafs; multi-leaf collimators (MLCs). To ensure that similarity or difference among is due to energy alone, same optimization constraints applied...