نتایج جستجو برای: computed tomography tube current modulation patient dose
تعداد نتایج: 2107551 فیلتر نتایج به سال:
The dose received by a patient on CT examination is expressed in size-specific estimates (SSDE) which function of the diameter, x-ray attenuation, and scanner output (volume computed tomography index, CTDIvol). Patient diameter attenuation are represented as water equivalent (Dw). We conducted research to analyze relationships between body weight Dw, CTDIvol, contrast-enhanced thorax examinatio...
background: to suggest south india ct diagnostic reference levels (drls) by collecting radiation doses for the most commonly performed ct examinations. materials and methods: a pilot study investigated the most frequent ct examinations. 110 ct sites were asked to complete a survey booklet to allow the recording of ct parameters for each of 3 ct examinations during a 1 year time period. dose dat...
Introduction: Cardiac CT (Computed Tomography) angiography applies as a pre-exam method for evaluating the patients with medical problems in their cardiac arteries. Due to the high delivered dose in this imaging method, dose reduction techniques and imaging strategies that serve the images quality with minimum patient dose are the subjects for investigation and research studies. This study will...
Background: Medical X-rays are the largest man-made source of public exposure to ionizing radiation. While the benefits of Computed Tomography (CT) are well known in accurate diagnosis, those benefits are not risk-free. CT is a device with higher patient dose in comparison with other conventional radiation procedures. Objective: This study is aimed at evaluating radiation dose to patients from ...
BACKGROUND Today, practically all computed tomography (CT) systems are delivered with automatic exposure control (AEC) systems operating with tube current modulation in three dimensions. Each of these systems has different specifications and operates somewhat differently. PURPOSE To evaluate AEC systems from four different CT scanner manufacturers: General Electric (GE), Philips, Siemens, and...
Background: Due to the presence of radiosensitive organs in the abdominopelvic region and increasing the number of requests for CT scan examinations, concerns about increasing radiation doses in patients has been greatly elevated. Therefore, the goal of this study was to determine the absorbed dose of radiosensitive organs and the effective dose in patients underwent abdominopelvic CT scan usin...
AIM To compare radiation dose and image quality of low-dose computed tomography (CT) protocol combined with hybrid-iterative reconstruction algorithm with standard-dose CT examinations for follow-up of oncologic patients. METHODS Fifty-one patients with known malignant diseases which underwent, during clinical follow-up, both standard-dose and low-dose whole-body CT scans were enrolled. Low-d...
In the screening and identifying of colon rectum malignancy, computed tomography colonography (CTC) is a highly effective imaging technique, albeit patients receiving significant dose. Accordingly, patient dose evaluation an important need, seeking to ensure benefits outweigh projected cancer risk. Objective: For CTC procedures carried out in Radiology Department, Medical Imaging Operation Serv...
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