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...

background : medical x-rays are the largest man-made source of public exposure to ionizing radiation. while the benefits of computed tomography (ct) are well known in accurate diagnosis, those benefits are not risk-free. ct is a device with higher patient dose in comparison with other conventional radiation procedures. objective: this study is aimed at evaluating radiation dose to patients from...

introduction: during radiotherapy, high accuracy in the dose delivery is required because there is a strong  relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. in  many institutions, in vivo dosimetry using diodes is performed to check the actual dose delivered. in general,  the uncertainty in the dose delivered should fall within  ± 5% of the...

background: prompt gamma neutron activation analysis (pgnaa) is known as a non-invasive technique capable of measuring elemental concentration in voluminous samples in a short period of time. also it is a valuable diagnostic tool for total body elemental measurements. 252cf and 241am-be sources which are usually used in this method, generate not only neutrons, but also emit high-energy and unwa...

introduction exposure to chronic levels of ionizing radiation could be detrimental to health even at very low doses. calabar free trade zone (cftz) was established to promote export business in nigeria and it is yet to produce exposure data of the zone. materials and methods the zone was divided into three categories depending on the type of business. category a had facilities with manufacturin...

background: although catalytic properties of different genetic polymorphisms of vkorc1 and cyp2c9 products have been identified, there is limited study available regarding warfarin dose requirement in iranian patient population. this study investigates the impact of these polymorphisms on 115 patients, referred to payvand clinical and specialty laboratory for determining the appropriate dose of...

Introduction: Active personal dosimeters (APDs) are well accepted as useful and reliable instruments for individual dosimetry measurements. APDs have many advantages compared with passive dosimeters for individual external radiation dose assessments. In routine monitoring, occupational exposure is carried out for verification and demonstration of compliance with the regulatory dose limits. So, ...

in chronic granulomatous disease (cgd) patients, esophageal stricture is a rare complication and the treatment of choice is still controversial. there are few reports of successful therapy with antibiotics, corticosteroids, multiple balloon dilatations or their combination. we report a 3-three-year-old iranian boy with recurrent esophageal obstruction due to cgd. the patient transiently respond...

Physician-patient relationship has been undergoing significant change in recent decades in the Western countries. Based upon a client-centered approach, society has given more autonomy and liberty to the patient. The patient has been regarded as a consumer who is looking for the best and most scientific approach and has freedom to choose among different methods for treatment. The role of the ph...