نتایج جستجو برای: External radiotherapy

تعداد نتایج: 248949  

Journal: :basic and clinical cancer research 0
alireza mohammadkarim department of engineering, science and research branch, islamic azad university, tehran, iran mahmoud allahverdi department of medical physics, tehran university of medical science, tehran, iran mahbod esfehani radiotherapeutic oncology department of cancer institute hasanali nedaie department of radiotherapy, tehran university of medical science, tehran, iran alireza shirazi department of medical physics, tehran university of medical science, tehran, iran

background: delivering the maximum dose to tumor while achieving the minimum dose delivery to normal tissue; is the most important goal in external radiotherapy. diode in vivo dosimetry is widely considered to be an important tool for quality improvement of patient care in external radiotherapy. uncertainty in dose delivery should fall within 5% of the prescribed dose as recommended by internat...

Journal: :iranian journal of cancer prevention 0
hamideh nazemi-gelyan dept. of medical physics, semnan university of medical sciences, semnan, iran hadi hasanzadeh dept. of medical physics, semnan university of medical sciences, semnan, iran yasha makhdumi reza radiotherapy oncology charity center, mashhad, iran sara abdollahi dept. of radiotherapy, iran university of medical sciences, tehran, iran fatemeh akbari reza radiotherapy oncology charity center, mashhad, iran fatemeh varshoee-tabrizi reza radiotherapy oncology charity center, mashhad, iran

background: radiotherapy plays an important role in the management of most malignant and many benign primary central nervous system (cns) tumors. radiotherapy affects both tumor cells and uninvolved normal cells; so, it is important to estimate absorbed dose to organs at risk in this kind of treatment. the aim of this study was to determine the absorbed dose to chiasma, lens, optic nerve, retin...

Journal: :iranian journal of medical physics 0
payam samadi miandoab department of electrical and computer engineering, medical radiation group, graduate university of advanced technology, haft bagh highway, knowledge paradise, kerman, iran. ahmad esmaili torshabi department of electrical and computer engineering, medical radiation group, graduate university of advanced technology, haft bagh highway, knowledge paradise, kerman, iran. saber nankali department of electrical and computer engineering, medical radiation group, graduate university of advanced technology, haft bagh highway, knowledge paradise, kerman, iran. mohammad reza rezaie department of electrical and computer engineering, medical radiation group, graduate university of advanced technology, haft bagh highway, knowledge paradise, kerman, iran.

introduction patient set-up optimization is required in radiotherapy to fill the accuracy gap between personalized treatment planning and uncertainties in the irradiation set-up. in this study, we aimed to develop a new method based on neural network to estimate patient geometrical setup using 4-dimensional (4d) xcat anthropomorphic phantom. materials and methods to access 4d modeling of motion...

Journal: :iranian journal of radiation research 0
a. naik roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india o.p. gurjar roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india p. bagdare roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india k.l. gupta roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india v. bhandari roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india m. kausar roentgen-saims radiation oncology centre, sri aurobindo institute of medical sciences, indore, india

background: external beam radiotherapy (ebrt) is mainstay of treatment in patients with locally advanced cervical carcinoma (lacc). three dimensional conformal radiotherapy (3dcrt) and intensity modulated radiotherapy (imrt) are mainly used in ebrt. however which one is superior is still controversial. materials and methods: forty patients of lacc treated with imrt were selected for this study....

Journal: :journal of biomedical physics and engineering 0
h khosravi tarbiat modares university b hashemi tarbiat modares university s r mahdavi irani university of medical sciences p hejazi semnan university of medical sciences

background: gel polymers are considered as new dosimeters for determining radiotherapy dose distribution in three dimensions. objective: the ability of a new formulation of magic-f polymer gel was assessed by experimental measurement and monte carlo (mc) method for studying the effect of gold nanoparticles (gnps) in prostate dose distributions under the internal ir-192 and external 18mv radioth...

Background: Gel polymers are considered as new dosimeters for determining radiotherapy dose distribution in three dimensions.Objective: The ability of a new formulation of MAGIC-f polymer gel was assessed by experimental measurement and Monte Carlo (MC) method for studying the effect of gold nanoparticles (GNPs) in prostate dose distributions under the internal Ir-192 and external 18MV radiothe...

Journal: :Onkologie 2021

Nenádorová radioterapie se používá nejčastěji k léčbě zánětlivých i degenerativních nemocí pohybového ústrojí. Stereotaktické techniky používají pro léčbu neuralgie trigeminu a perspektivně jeví její využití při terapii funkčních onemocnění. Kromě České republiky je nenádorová velmi využívána v Německu, kdy počty pacientů s nenádorovou radioterapií...

Introduction: External radiotherapy is the most common method of radiotherapy which the most important problem associated with is that there is no difference between healthy and tumor tissues in dose absorption. One way to differentiate the dose sensitivity is to use metal-based nanoparticles. Bismuth oxide nanoparticles are good candidates for cancer radiotherapy. In this study, we investigate...

Journal: :iranian journal of nuclear medicine 2001
farnaz amouzegar-hashemi peiman haddad seyed morteza sajjadi

a retrospective study was undertaken to examine the thyroid cancer cases referred for external radiotherapy to our department during the period of 1991-99. within this period, a total of 33 patients had been treated by irradiation for thyroid cancer or its metastases and these cases were evaluated for age, sex, pathology and type of surgery. the reason of patients’ referral for external radioth...

2003
ERVIN B. PODGORSAK

Radiotherapy procedures fall into two main categories: external beam radiotherapy and brachytherapy. In external beam radiotherapy the radiation source is at a certain distance from the patient and the target within the patient is irradiated with an external radiation beam. In brachytherapy (see Chapter 13) radiation sources are placed directly into the target volume (intracavitary or interstit...

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