Objective: In this study, we aimed to validate the accuracy of computed tomography-based attenuation correction (CTAC) using the bilinear scaling method.Methods: The measured attenuation coefficient (μm) was compared to a theoretical attenuation coefficient (μt ) using four different CT scanners and an RMI 467 phantom. The effective energy of the CT beam X-rays was calculated, using the aluminu...

introdouction: cone beam computed tomography (cbct) is a relatively new three-dimensional imaging technology, which has been widely used in dental and maxillofacial imaging. materials and methods: cbct scans of 506 maxillary sinuses of 253 individuals (39.9% male and 60.1% female) were evaluated retrospectively for assessing the relationship between sinus mucosal thickening (mt) and dental and ...

background subdiaphragmatic activity can produce subdiaphragmatic-related artifacts, which can degrade the quality of myocardial perfusion imaging (mpi). objectives we examined the impact of drinking milk, water, and lemon juice on different subdiaphragmatic-related artifacts by using 99mtc-sestamibi myocardial single-photon emission computed tomography (spect) in order to determine a feasible ...

introduction: in cases of blunt abdominal traumas, predicting the possible intra-abdominal injuries is still a challenge for the physicians involved with these patients. therefore, this study was designed, to evaluate the accuracy of urinalysis in predicting intra-abdominal injuries. methods: patients aged 15 to 65 years with blunt abdominal trauma who were admitted to emergency departments wer...

introduction: chest x-ray (cxr) is the simplest diagnostic tool of community acquired pneumonia (cap), but it has some limitation. therefore, the aim of this study is comparing the diagnostic accuracy of cxr and chest ultrasonography (cus) in detection of cap. methods: in the present study, a consecutive sample of suspected patients with cap was underwent cus, cxr, and chest computed tomography...

background: total knee arthroplasty is a complex procedure aiming to relieve pain and improve function. it is critical to select prosthesis that best cover the bone surfaces. ethnicity may affect fitness of the components mainly designed for caucasian populations. this study aimed to evaluate morphometric features of proximal tibia in iranian population.   methods : during 2013, 150 consecutive...

conclusion the cbct may be safe to use in determining root canal wl. because lower radiation dose, a pre-existing cbct can be useful to detect the root canal wl more precisely. results the cbct was the most accurate method to evaluate the root canal wl, with accuracy of 70%. accuracy for the apex locator and periapical radiograph were 40% and 30%, respectively. materials and methods totally, 30...

conclusion scout views may be useful in determining dose and image quality in ct scanning; however, it is necessary to first determine the most appropriate scout view for ct scans. background while using the automatic exposure control technique in computed tomography (ct), the scout view determines the radiation dose for the ct scan by taking anatomical morphology into consideration. objectives...

objective(s): in this study, we aimed to evaluate the efficacy of thyroid volume measurement using 99mtc pertechnetate single-photon emission computed tomography (spect) images, acquired by the standardized uptake value (suv)-shape scheme designed by our expert team.methods: a total of 18 consecutive patients with graves’ disease (gd) were subjected to both ultrasonographic and 99mtc pertechnet...

results the degree of systolic compression was found to be correlated with the depth of the mb. however, there was no correlation between the length of the mb and the degree of systolic compression. conclusion the systolic compression of the mb was influenced by the depth of the tunneled segment, not by its length. background myocardial bridging (mb) is a congenital anomaly in which a segment o...