Evaluation of stair-step artifact on Virtual CT Endoscopy : using"Y"shaped acryl phantom
نویسندگان
چکیده
منابع مشابه
CT-virtual endoscopy of the urinary tract.
OBJECTIVE To demonstrate the various applications of CT-virtual endoscopy, for the assessment of urinary tract abnormalities. MATERIALS AND METHODS Sixty-three patients were evaluated by CT-virtual endoscopy (49 CT-cystoscopy; 14 CT-pyeloureteroscopy). CT-cystoscopy was obtained for follow-up of bladder tumor (n=21), radiologic suspicion (n=12) or radiologic evidence of urinary tract lesion (...
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Purpose Evaluation of airway stenosis secondary to head and neck lesions has been performed routinely with CT scan and endoscopy (1). Endoscopy of a stenotic airway can be difficult, and can be associated with compromise of the airway (2). CT virtual endoscopy (CTVE) provides a noninvasive means of evaluating the airways while simultaneously studying the head and neck soft tissues including vas...
متن کاملBanding and Step-Stair Artifacts on the Cardiac-CT Caused By Pseudo-Ectopic Beats.
Step-stair and banding artifacts may result from irregular ventricular rhythm caused by atrial fibrillation or premature ectopic ventricular contractions. In the case reported here, severe banding and misalignment artifacts occurred due to electrocardiographic noise mimicking ectopic beats. Severe EKG noise or pseudo-ectopic beats may cause rare but serious artifacts during cardiac-CT acquisiti...
متن کاملStair-step Patterns from Arrays
In array antennas, the shaped beams are produced either by amplitude control or phase control. In the present work, an attempt is made to produce them with the introduction of new aperture distribution without additional phase. Stair-step patterns are produced using Fourier transform method after introducing the proposed aperture distribution. The computed patterns are presented. These patterns...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1998
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001351693