منابع مشابه
Multi-Slice CT Scanners
In the second half of 1998, four manufacturers (GE, Siemens, Toshiba and Picker, now Philips) extended this concept by launching multi-slice CT scanners. All were 3rd generation helical scanners, with low voltage slip rings, capable of acquiring four CT slices in one x-ray tube rotation (see Fig. 1). Additional four-slice models have been introduced by Toshiba and GE. Some basic specifications ...
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To the Editor: We read with interest the recent article by Meyer et al. on the estimation of local cerebral blood flow (LCBF) from sequential transmission computed tomography (CT) during inhalation of stable xenon gas. There are a number of points we wish to raise concerning the methodology of the assertions made in the paper. We are somewhat puzzled by a number of statements concerning the per...
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In this paper, we present a method that uses a combination of experimental and modeled data to assess properties of x-ray beam measured using a small-animal spectral scanner. The spatial properties of the beam profile are characterized by beam profile shape, the angular offset along the rotational axis, and the photon count difference between experimental and modeled data at the central beam ax...
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Hybrid scanners, which enable the performance of single photon emission tomography (SPECT) and X-ray computerized tomography (CT) in one procedure, have considerable potential as an all-rounder in the nuclear medicine departments. However, challenges remain in validating the accuracy of such hybrid systems. In this paper, a systematic validation method with minimum user interaction is proposed,...
متن کاملEvaluation of the gray level in CBCT systems and its relationship with HU in CT Scanners
Introduction: Cone-beam CT (CBCT) is an imaging system which offers three-dimensional (3D), multiplanar images and has many advantages over computed tomography (CT) including shorter acquisition times for the resolution desired in dentistry, lower radiation dose to the patient, reasonable price and higher spatial resolution but CBCT scanners are unable to display actual Hounsf...
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ژورنال
عنوان ژورنال: JAPANES JOURNAL OF MEDICAL INSTRUMENTATION
سال: 1977
ISSN: 0385-440X,1881-4875
DOI: 10.4286/ikakikaigaku.47.3_140