Single-slice versus multi-slice display for human-observerlesion-detection studies

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PURPOSE: Presentation and evaluation of slice sensitivity profile and pixel noise of multi-slice CT in comparison to single-slice CT. METHODS: Slice sensitivity profiles and pixel noise of a multi-slice CT equipped with a 2D matrix detector array and of a single-slice CT were evaluated in phantom studies. RESULTS: For the single-slice CT the width of the slice sensitivity profiles increased with increasing pitch. In spite of a much higher table speed the slice sensitivity profiles of multi-slice CT were narrower and did not increase with higher...

BACKGROUND AND OBJECTIVE: The aim of this study was to demonstrate the utility of volume rendered multi-slice helical three-dimensional CT angiography in patients with cerebral aneurysm when compared with single slice CT angiography and formal digital subtraction angiography. METHODS: A prototype Toshiba Aquilon multi-slice CT scanner was employed with the following scan conditions: voltage 135 kV; current 300 mA; slice thickness 0.8 mm; scan speed 0.75 sec/cycle; couch speed 1 mm/sec; range 50 mm from foramen magnum; scan pitch 3; three dimens...

PURPOSE: The purpose of study was to compare patient dose applying singleslice- and multislice-spiral CT. METHODS: The examinations were performed with a singleslice-spiral CT (Highspeed Advantage; GE Medical Systems; Milwaukee, USA) and with a multislice CT systems (LightSpeed QX/i GE Medical Systems; Milwaukee, USA). For the determination of the radiation exposure (absorbed dose) a selection of most executed protocols (thorax-helical, abdomen-helical, petrous bone-axial, head-axial) were simulated using an Alderson Rando Phantom. The dose was...

Multi-slice (MS) technology increases the efficacy of CT procedures and offers new promising applications. The expanding use of MSCT, however, may result in an increase in both frequency of procedures and levels of patient exposure. It was, therefore, the aim of this study to gain an overview of MSCT examinations conducted in Germany in 2001. All MSCT facilities were requested to provide information about 14 standard examinations with respect to scan parameters and frequency. Based on this data, dosimetric quantities were estimated using an exp...

PURPOSE: The absorbed dose during clinical examinations of the head, thorax, abdomen and pelvis performed with a single-slice CT scanner and a new multi-slice CT system was measured and compared. Technical parameters, defined at installation and memorized on the two CT machines relate to a standard-sized patient and were considered the reference standard. Our experimental data were also been compared with the Diagnostic Reference Levels (D.L. 26/5/2000 n.187, Annex V). MATERIAL AND METHODS: We compared the performance of a multi-slice GE LightS...

PURPOSE: Comparison of the radiation exposure of the head, midface and pelvis in multi-slice CT (MSCT) and single-slice CT (SSCT) for manufacturer-implemented standard protocols. MATERIALS AND METHODS: An anthropomorphic Alderson-Rando phantom equipped with LiF-thermoluminescent dosimeters in the head, neck and pelvic region was examined with different MSCT and SSCT protocols, and the measured organ doses were compared. RESULTS: In comparison with the SSCT protocols, the MSCT protocols delivered about twice the organ dose to the head and pelvis...

Our objective was to compare a single-slice CT (SS-CT) scanner with a multi-slice CT (MS-CT) scanner in the depiction of osseous anatomic structures and fractures of the upper cervical spine. Two cervical spine specimens with artificial trauma were scanned with a SS-CT scanner (HighSpeed, CT/i, GE, Milwaukee, Wis.) by using various collimations (1, 3, 5 mm) and pitch factors (1, 1.5, 2, 3) and a four-slice helical CT scanner (LightSpeed, QX/i, GE, Milwaukee, Wis.) by using various table speeds ranging from 3.75 to 15 mm/rotation for a pitch of ...

BACKGROUND/AIMS: The aim of this study is to compare preoperative single-slice CT (SSCT) and multislice-CT (MSCT) accuracy in the evaluation of patients with bowel obstruction and intestinal necrosis. METHODOLOGY: 64 patients were enrolled. We analyzed the SSCT scans of 30 patients and the MSCT scans of 34 patients with clinical and abdominal plain film evidence of bowel obstruction. Presence, site, kind, and cause of the obstruction were evaluated; specific signs of strangulating or closed loop obstruction and wall necrosis were also identifie...

Abstract Use of a single-slice (2D) display for observer studies may bias results and reduce the study's clinical generalizability. Human observers perform better at the task of lesion detection with 3D-processed images than they do with 2D-processed images when the images are presented using a 2D display. However, 3D-processing techniques incorporate information from out-of-plane or adjacent slices into an image and thus provide more information to the observer than does a similar 2D-processing method. Observer performance with 2D-processing ...

Abstract Use of a single-slice (2D) display for observer studies may bias results acid reduce the studies' clinical generalizability. Human observers perform better at the task of lesion detection with 3D-processed images than they do with 2D-processed images when the images are presented using a 2D display. However, 3D-processing techniques incorporate information from out-of-plane or adjacent slices into an image and thus provide more information to the observer than does a similar 2D-processing method. Observer performance with 2D-processin...

OBJECTIVE: The purpose of this study was to assess abilities of single thick-slice MR cholangiopancreatography and multiple thin-slice multiprojection volume reconstruction (MPVR) MR cholangiopancreatography to evaluate diseases in and around the pancreas. SUBJECTS AND METHODS: Eighty-nine patients underwent both single and MPVR MR cholangiopancreatography using a single-shot fast spin-echo technique. Image quality (five-point scale), visualization of the common bile and pancreatic ducts (three-point scale), stenotic, dilatational, or cystic ch...