the presence of anatomic variations of paranasal sinuses must be noted in order to attain a full understanding and accurate diagnosis of chronic sinusitis. the frequency of anatomic variations in chronic sinusitis is different in various studies. the purpose of this study is to assess the frequency of anatomic variations in chronic sinusitis patients admitted to otolaryngology ward of shahid sa...

introduction in ct imaging, metallic implants inside the tissues cause metal artifact that reduce the quality of image for diagnosis. in order to reduce the effect of this artifact, a new method with more appropriate results has been presented in this research work. materials and methods the presented method comprised of following steps: a) image enhancement and metal areas extraction, b) sinog...

Carotid endarterectomy without preoperative angiography is a viable alternative that avoids the risk of angiography and potentially reduces the overall morbidity and mortality associated with the workup of patients with carotid artery disease and surgical management. The success of this approach is dependent upon the accuracy of the history and physical examination, acquisition of a CT head sca...

Coronary arteries are the blood vessels supplying oxygen-rich blood to the heart muscles. Coronary artery calcium (CAC), which is the total amount of calcium deposited in these arteries, indicates the presence or the future risk of coronary artery diseases. Quantification of CAC is done by using computed tomography (CT) scan which uses attenuation of xray by different tissues in the body to gen...

A simple, practical method of applying incremental dynamic computed tomography (CT) to the imaging of 20 carotid bifurcations is described. The results are compared with those obtained by conventional carotid angiography and intravenous digital subtraction angiography (DSA). Conventional angiography provided additional information about the carotid bifurcation in only one of 14 cases, while inc...

OBJECTIVES We assessed the usefulness of 64-slice computed tomography coronary angiography (CTCA) to detect or rule out coronary artery disease (CAD) in patients with various estimated pretest probabilities of CAD. BACKGROUND The pretest probability of the presence of CAD may impact the diagnostic performance of CTCA. METHODS Sixty-four-slice CTCA (Sensation 64, Siemens, Forchheim, Germany)...

A 53-year-old woman complaining of worsening dys-pnoea and enlarging swelling in the neck after cough and acute sudden pain at the base of the neck. Contrast enhanced CT scan showing large cervical and mediastinal hematoma with bilateral pleural effusion (Fig. 1). Angiography: ruptured aneurysm of left lower thyroid artery treated by embolization (Fig. 2). Fig. 1. Contrast enhanced CT scan show...

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