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...

As we know breast cancer is the second death reason in Iran. One step of treatment process is radiotherapy, which needs careful consideration of contouring and therapeutic techniques Lung, thyroid, spinal cord, trachea and humerus are sensitive organs in breast cancer radiation therapy.  The most clinical studies recommended two ways for delivering 95 percent of dose to supraclavicular and ...

Background: Radiodine therapy (RIT) for hyperthyroidism is increasingly used as a therapy of choice in most of the patients. Effect of multiple factors on the result of therapy was noted. This study tries to analyze the effect of multiple factors on success rate of RIT. Methods and patients: One hundred and sixty four hyperthyroid patients referred for RIT therapy from 1996-99, were studi...

The 2011 Great East Japan Earthquake led to a subsequent nuclear accident at the Fukushima Daiichi Nuclear Power Plant. In its wake, we sought to examine the association between external radiation dose and thyroid cancer in Fukushima Prefecture. We applied a cross-sectional study design with 300,476 participants aged 18 years and younger who underwent thyroid examinations between October 2011 a...

A normal pregnancy results in a number of important physiological and hormonal changes that alter thyroid function. These changes mean that laboratory tests of thyroid function must be interpreted with caution during pregnancy. Levels of thyroxine binding globulin (TBG) and production of T3 and T4 hormones and the daily requirement of iodine in pregnancy are increased to 50%, TSH receptor stimu...

The aim of this study was to assess effective doses of a lateral cephalogram radiograph with and without thyroid shield and compare the differences with the radiation dose of a hand-wrist radiograph. Thermoluminescent dosimeters were placed at 19 different sites in the head and neck of a tissue-equivalent human skull (RANDO phantom). Analogue lateral cephalograms with and without thyroid shield...

IMPORTANCE Few studies have evaluated the association of radiation dose with thyroid nodules among adults exposed to radiation in childhood. OBJECTIVE To evaluate radiation dose responses on the prevalence of thyroid nodules in atomic bomb survivors exposed in childhood. DESIGN, SETTING, AND PARTICIPANTS This survey study investigated 3087 Hiroshima and Nagasaki atomic bomb survivors who we...

background: radiodine therapy (rit) for hyperthyroidism is increasingly used as a therapy of choice in most of the patients. effect of multiple factors on the result of therapy was noted. this study tries to analyze the effect of multiple factors on success rate of rit. methods and patients: one hundred and sixty four hyperthyroid patients referred for rit therapy from 1996-99, were studied. th...

although the basic question of ablative threshold dose for ablation of thyroid remnant after surgery yet remains unanswered. but radioiodine therapy is being used as a standard method of treatment. in present research, treatment responces for 100 patients with thyroid cancer treated with 3660 mbq of ¹³¹i were studied. significant response differences between female group (66%) and male group (3...