Angulation of CT gantry.
نویسندگان
چکیده
منابع مشابه
Evaluation of gantry rotation overrun in axial CT scanning
The purpose of this study was to develop and evaluate a simple method to assess gantry rotation overrun in a single axial CT scanning. The exposure time in the axial scanning was measured at selected nominal rotation times (400, 700, and 1000 ms) using a solid-state detector, the RTI's CT dose profiler (CTDP). CTDP was placed at the isocenter and the radiation dose rate signal (profile) was rec...
متن کاملMeasurement of gantry rotation time in modern ct
The purpose of this study was to develop and evaluate a noninvasive method to assess rotation time in modern commercial computed tomography (CT) systems. The rotation time was measured at a selected nominal rotation time (400 ms) utilizing two types of solid-state detectors: the RTI's CT Dose Profiler (CTDP) and Unfors' Xi (Xi) probes. Either CTDP or Xi was positioned on the inner cover of the ...
متن کاملAssessment of dose reduction and influence of gantry rotation time in CT abdomen examinations
Background: Worldwide the computed tomography (CT) scanning is recognized as a high radiation dose modality. This article aimed to estimate the radiation dose reduction and radiogenic risks for adult patients undertaking abdominal CT examinations. Materials and Methods: A total of 128 patients were studied using 2, 4, 16 and 64 slice CT scanners. The patients were divided into two categories: t...
متن کاملTechnical note: mobile CT scanner gantry for use in the operating room.
In modern neurosurgical practice, CT is a well established, important examination for planning surgery and perioperative care. Recently, CT scanners have been used for intraoperative imaging during craniotomy [1-6]. In this paper, we report a newly developed mobile CT scanner gantry with a modified fork-lift gantry carrier. This system enables the radiologist to obtain CT images during surgery ...
متن کاملEvaluation of gantry speed on image quality and imaging dose for 4D cone-beam CT acquisition
BACKGROUND This study investigates the effect of gantry speed on 4DCBCT image quality and dose for the Varian On-Board Imager®. METHODS A thoracic 4DCBCT protocol was designed using a 125 kVp spectrum. Image quality parameters were evaluated for 4DCBCT acquisition using Catphan® phantom with real-time position management™ system for gantry speeds varying between 1.0 to 6.0°/s. Superior-inferi...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 1994
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.162.5.8166022