Introduction: In radiotherapy treatment planning system (TPS), basic input is the data from computed tomography (CT) scan, which takes into account the effect of inhomogeneities in dose calculations. Measurement of CT numbers may be affected by scanner-specific parameters. Therefore, it is important to verify the effect of different CT scanning protocols on Hounsfield unit (HU) and its impact o...

how to cite this article: fallah r, nafisi moghadam r, fallah tafti m, salmani nodoushan m. results of noncontrast brain computed tomography scans of 1-18 year old epileptic children. iran j child neurol 2012; 6(3): 33-38. objective the advent of computed tomography (ct) scan revolutionized the diagnosticevaluation of neurologic patients. the aim of this study was to evaluate brain ctresults of...

background the present data show a global increase in the rate of cardiovascular disease. cardiac ct angiography has developed as a fast and non-invasive cardiac imaging modality following the introduction of multi-slice computed tomogaraphy. conclusions the total mean radiation dose to the thyroid and gonads was 0.36 msv, and 96.5 μsv, respectively for the subjects. these values were high for ...

pleural epithelioid hemangioendothelioma (ehe) is a rare malignancy of vascular-endothelial origin with non-specific symptoms and an unpredictable outcome. diagnosis of this condition by imaging modalities is challenging, and no standard therapeutic approaches have been established in this regard. in this paper, we described the case of a patient with a low-grade fever, coughing and chest pain ...

background and aims. with the introduction of cone beam computed tomography (cbct) in dentistry, a question has been raised whether the technique significantly increases the diagnostic accuracy in comparison with other techniques or not. therefore, the present study was undertaken to assess the accuracy of cbct modality in detecting proximal carious lesions as compared to conventional periapica...

results loss of consciousness (gcs drop or amnesia) was markedly associated with abnormal brain ct scan (p < 0.05). interestingly, we found 7 patients with normal clinical examination but significant abnormal brain ct scan. conclusions according to the results of our study, we recommend that all patients with minor head trauma underwent brain ct scan in order not to miss any life-threatening he...

objective(s): the aim of this study was to determine the optimal reconstruction parameters for iterative reconstruction in different devices and collimators for dopamine transporter (dat) single-photon emission computed tomography (spect). the results were compared between filtered back projection (fbp) and different attenuation correction (ac) methods.methods: an anthropomorphic striatal phant...

for obtaining reservoir petrophysical properties, for example porosity, non-destructive methods such as x-ray computed tomography, ct, seems to be precise and accurate. porosity is deducted from the ct image with a single scan via different techniques, such as pore space detection by image segmentation techniques then correlation with porosity. more than one hundred samples with carbonate litho...

magnetic resonance imaging (mri) uses a constant magnetic field and radio waves, a non-invasive method for examining tissues, organs and the skeletal system. the advantages and disadvantages of mri is not fully understood. in the computerized tumor (ct) scan, as an invasive method, the x-rays of the body is used for tomography; which different x-ray attenuation coefficient in tissues as well as...

anaplastic thyroid carcinoma is an uncommon, highly aggressive malignancy usually presenting in the elderly. an eighteen year old boy was recently diagnosed as anaplastic carcinoma of the thyroid.  pet/cect scan performed for staging, revealed a large fdg avid heterogeneously enhancing thyroid mass with bilateral jugular venous thrombosis, which also showed increased fdg uptake, thus pointing t...