First performance evaluation of a dual-source CT (DSCT) system

Flohr, Thomas; McCollough, Cynthia H.; Bruder, Herbert; Petersilka, Martin; Gruber, Klaus; Süß, Christoph; Grasruck, M.; Stierstorfer, Karl; Krauß, Bernhard; Raupach, Rainer; Primak, Andrew N.; Küttner, A.; Achenbach, Susanne; Becker, Christoph R.; Kopp, Andreas F.; Ohnesorge, Bernd

doi:10.1007/s00330-005-2919-2

Cited by 1,260 publications

(489 citation statements)

References 45 publications

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“…This system consists of two X-ray tubes mounted on one gantry at a 90°angle [14] and two corresponding 64-section detectors. One detector (detector A) covers a 50-cm field of view and the other detector (detector B) covers a 26-cm field of view [14]. Patients were positioned supine on the table.…”

Section: Imaging Protocol and Scan Parametersmentioning

confidence: 99%

Improved Image Quality and Detectability of Hypovascular Liver Metastases on DECT with Different Adjusted Window Settings

Altenbernd

Forsting

Lauenstein

et al. 2016

Fortschr Röntgenstr

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ZUSAMMENFASSUNGZiel Untersuchung der Dual-Energy-Computertomografie (DECT) von hypovaskularisierten Lebermetastasen (LM) unter Berücksichtigung der Fensterwerteinstellungen (WS). Ziel der Studie ist zu untersuchen, inwiefern angepasster WS sowie die Niedrig-Energie-Datensätze der DECT die Erkennbarkeit insbesondere kleiner LM verbessern. This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited. Conclusion Low kVp images of DECT datasets are more precise in detecting hypovascular liver metastases than virtual 120 kVp images.Dedicated window settings have a relevant influence on conspicuity.Key points: ▪ DECT is a promising tool for detecting hypovascular liver metastases.▪ The diagnostic value of low kVp image data can be significantly increased by using special window settings. ▪ Use of only the low kVp images would lead to reduced radiation exposure. Citation Format

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Section: Imaging Protocol and Scan Parametersmentioning

confidence: 99%

Improved Image Quality and Detectability of Hypovascular Liver Metastases on DECT with Different Adjusted Window Settings

Altenbernd

Forsting

Lauenstein

et al. 2016

Fortschr Röntgenstr

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“…The introduction of dual-source systems to clinical CT in 2005 [13,58], which provided higher X-ray power and shorter effective scan times, may also be an option for Carm systems. Bi-plane systems are already used routinely.…”

Section: Potential Future Developmentsmentioning

confidence: 99%

Flat-detector computed tomography (FD-CT)

2007

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Flat-panel detectors or, synonymously, flat detectors (FDs) have been developed for use in radiography and fluoroscopy with the defined goal to replace standard X-ray film, filmscreen combinations and image intensifiers by an advanced sensor system. FD technology in comparison to X-ray film and image intensifiers offers higher dynamic range, dose reduction, fast digital readout and the possibility for dynamic acquisitions of image series, yet keeping to a compact design. It appeared logical to employ FD designs also for computed tomography (CT) imaging. Respective efforts date back a few years only, but FD-CT has meanwhile become widely accepted for interventional and intraoperative imaging using C-arm systems. FD-CT provides a very efficient way of combining two-dimensional (2D) radiographic or fluoroscopic and 3D CT imaging. In addition, FD technology made its way into a number of dedicated CT scanner developments, such as scanners for the maxillo-facial region or for micro-CT applications. This review focuses on technical and performance issues of FD technology and its full range of applications for CT imaging. A comparison with standard clinical CT is of primary interest. It reveals that FD-CT provides higher spatial resolution, but encompasses a number of disadvantages, such as lower dose efficiency, smaller field of view and lower temporal resolution. FD-CT is not aimed at challenging standard clinical CT as regards to the typical diagnostic examinations; but it has already proven unique for a number of dedicated CT applications, offering distinct practical advantages, above all the availability of immediate CT imaging in the interventional suite or the operating room.

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“…In recent years, new CT systems equipped with dual X‐ray sources (DS) in one gantry have been introduced into clinical practice and found to increase temporal resolution compared with that of a single‐source system 9 , 13 . The higher temporal resolution of a 128‐section DSCT allows the use of a prospective ECG‐triggered spiral mode at a high pitch factor 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

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One‐hundred‐and‐twenty‐eight–section dual X‐ray source computed tomography (CT) systems have been introduced into clinical practice and have been shown to increase temporal resolution. Higher temporal resolution allows low‐dose spiral mode at a high pitch factor during CT coronary angiography. We evaluated radiation dose and physical image qualities in CT coronary angiography by applying high‐pitch spiral, step‐and‐shoot, and low‐pitch spiral modes to determine the optimal acquisition mode for clinical situations. An anthropomorphic phantom, small dosimeters, a calibration phantom, and a microdisc phantom were used to evaluate the radiation doses absorbed by thoracic organs, noise power spectrums, in‐plane and z‐axis modulation transfer functions, slice sensitivity profiles, and number of artifacts for the three acquisition modes. The high‐pitch spiral mode had the advantage of a small absorbed radiation dose, but provided low image quality. The low‐pitch spiral mode resulted in a high absorbed radiation dose of approximately 200 mGy for the heart. Although the absorbed radiation dose was lower in the step‐and‐shoot mode than in the low‐pitch spiral mode, the noise power spectrum was inferior. The quality of the in‐plane modulation transfer function differed, depending on spatial frequency. Therefore, the step‐and‐shoot mode should be applied initially because of its low absorbed radiation dose and superior image quality.PACS numbers: 87.57.‐s; 87.57.C‐; 87.57.cf; 87.57.cm; 87.57.cp; 87.57.Q‐; 87.57.qp; 87.57.uq

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First performance evaluation of a dual-source CT (DSCT) system

Cited by 1,260 publications

References 45 publications

Improved Image Quality and Detectability of Hypovascular Liver Metastases on DECT with Different Adjusted Window Settings

Improved Image Quality and Detectability of Hypovascular Liver Metastases on DECT with Different Adjusted Window Settings

Flat-detector computed tomography (FD-CT)

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

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