Abstract:
:We describe the effect of the off-center position, the bowtie filter type, and the direction of scan projection radiograph on the radiation dose and image noise of 64-detector computed tomographic scans using the automatic tube current modulation technique. On anteroposterior scan projection radiographs, the tube current ratio increased, with an increase in the off-center position of the phantom irrespective of the filter size. On lateral scan projection radiographs, it remained constant with each bowtie filter type regardless of the off-center phantom position.
journal_name
J Comput Assist Tomogrjournal_title
Journal of computer assisted tomographyauthors
Funama Y,Taguchi K,Awai K,Sakabe D,Shimamura M,Yamashita Ydoi
10.1097/RCT.0b013e31819d6f6fsubject
Has Abstractpub_date
2009-11-01 00:00:00pages
973-7issue
6eissn
0363-8715issn
1532-3145pii
00004728-200911000-00028journal_volume
33pub_type
杂志文章abstract:PURPOSE:The purpose of this work was to conduct an MR cholangiography study of hepatobiliary abnormalities in autosomal dominant polycystic kidney disease (ADPKD) and to correlate these abnormalities with the risk of infection. METHOD:Cystic and intrahepatic bile duct (IHBD) abnormalities identified by MR cholangiogra...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200203000-00013
更新日期:2002-03-01 00:00:00
abstract::Construction of a new ultrafast scanner system suitable for dynamic computed tomography is now under consideration, with development soon to begin. This system will be characterized by an electronically controlled X-ray generator with wide angle double diffraction, which will permit transverse axial images to be taken...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-197710000-00017
更新日期:1977-10-01 00:00:00
abstract:OBJECTIVE:To determine if gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance (MR) cholangiography can detect and localize bile duct leaks in postcholecystectomy patients. MATERIAL AND METHODS:Four blinded independent radiologists performed a retrospective review of 16...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0000000000000083
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVE:The purpose of the study was to evaluate the safety and efficacy of Gd-BOPTA for liver imaging and to determine the most appropriate clinical dose to administer. METHODS:Gd-BOPTA was administered at a dose of 0.05 (group A), 0.1 (group B), or 0.2 (group C) mmol/kg to 201 patients suspected of having malignan...
journal_title:Journal of computer assisted tomography
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1097/00004728-199911001-00010
更新日期:1999-11-01 00:00:00
abstract:PURPOSE:Recently, a new specific organ dose adaption and reduction protocol, or SODAR tool (X-CARE, Siemens Healthcare), which reduces dose to the anterior aspect of the body of patients, was installed on our computed tomographic scanner. The purpose of this pilot project was to evaluate image quality and dose distribu...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e318251ec61
更新日期:2012-05-01 00:00:00
abstract::Subcutaneous fat provides excellent contrast for water density tissue. Five patients with subcutaneous metastases visualized on computed tomography (CT) scans are presented. In some cases, CT proved to be the optimal diagnostic modality for visualizing these lesions and documenting their response to therapy. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-197807000-00005
更新日期:1978-07-01 00:00:00
abstract:OBJECTIVE:To assess the degree of extra scanning beyond the prescribed anatomic boundaries for thoracic and body computed tomographic (CT) scans and to identify associated factors. METHODS:For 442 consecutive chest, abdomen, and/or pelvis CT examinations, the length of extra scanning beyond the prescribed anatomic bou...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e3181f5a652
更新日期:2011-01-01 00:00:00
abstract::The magnetic resonance appearance of three lesions of focal nodular hyperplasia observed in two patients is reviewed. All three lesions demonstrated isointensity with the liver on the short repetition time (TR) and echo time (TE) spin echo images. One lesion also showed a central area of low signal intensity that path...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198707000-00019
更新日期:1987-07-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to develop and validate a novel noise insertion method that can accurately simulate lower-dose images from existing standard-dose computed tomography (CT) data. METHODS:The noise insertion method incorporates the effects of the bowtie filter, automatic exposure control, and el...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e318258e891
更新日期:2012-07-01 00:00:00
abstract:PURPOSE:The purpose of this work is to describe the CT and MR appearance of primary malignant fibrous histiocytoma (MFH) of the chest wall. METHOD:Eleven men and eight women (45-76 years old) with primary MFH of the chest wall who underwent both CT and MRI were enrolled, and the imaging interpretation was retrospectiv...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200207000-00015
更新日期:2002-07-01 00:00:00
abstract::Computed tomography (CT) has enabled noninvasive evaluation of coronary bypass graft patency. Thirty-three patients operated on with 75 venous coronary bypass grafts were studied in the early postoperative period. Scans were taken with geometric magnification with a field of view of 16 or 24 cm, which gave a high spat...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198112000-00006
更新日期:1981-12-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to explore the usefulness of combined virtual monochromatic imaging and metal artifact reduction software (MARS) for the evaluation of musculoskeletal periprosthetic tissue. METHODS:Measurements were performed in periprosthetic and remote regions in 80 patients using a high-definiti...
journal_title:Journal of computer assisted tomography
pub_type: 临床试验,杂志文章
doi:10.1097/RCT.0000000000000399
更新日期:2016-07-01 00:00:00
abstract:PURPOSE:We have devised, implemented, and tested a technique for creating a comprehensive probabilistic atlas of the human cerebral cortex, based on high-dimensional fluid transformations. The goal of the atlas is to detect and quantify subtle and distributed patterns of deviation from normal cortical anatomy, in a 3D ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199707000-00008
更新日期:1997-07-01 00:00:00
abstract:OBJECTIVES:: The aim of this study was to achieve the quantitative analysis of the characteristic computed tomography (CT) findings and course of interstitial pneumonia using the volume histogram method. METHODS:: Contrast (CNT), variance (VAR), and entropy (EPY) values from whole-lung volume data were compared betwee...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200603000-00014
更新日期:2006-03-01 00:00:00
abstract::An unusual case of isolated injury to the caudate lobe of the liver in a child is presented. The appearance of this injury is described, and its significance in relation to deep vascular structures of the porta hepatis and the portocaval space is discussed. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198805010-00038
更新日期:1988-05-01 00:00:00
abstract::Recurrent respiratory papillomatosis is a chronic disease of children and young adults associated with various complications, one of which is malignant change. We report CT findings of malignant change in a case of recurrent respiratory papillomatosis. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199509000-00020
更新日期:1995-09-01 00:00:00
abstract:PURPOSE:This study was designed to compare the sensitivity of T1- and diffusion-weighted images for the assessment of brain maturation in human brains. METHODS:T1- and diffusion-weighted images were obtained in 32 children without neurological abnormalities or growth retardation. The ages at which signal intensity cha...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199701000-00001
更新日期:1997-01-01 00:00:00
abstract:OBJECTIVE:The aim of the study was to establish the reference window settings for display of virtual monoenergetic images (VMIs) from spectral detector computed tomography when assessing hypodense liver lesions. METHODS:In patients with cysts (n = 24) or metastases (n = 26), objective (HU, signal-to-noise ratio [SNR])...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0000000000000794
更新日期:2018-11-01 00:00:00
abstract::Most renal metastases are asymptomatic, occur with widespread metastatic disease, and are too small to be detected with computed tomography (CT). Rarely they form large masses. These are typically angiographically hypovascular and show only minimal CT contrast enhancement. Renal carcinoma as a second primary malignanc...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198306000-00011
更新日期:1983-06-01 00:00:00
abstract:OBJECTIVE:To describe the thin-section computed tomography (CT) findings of Sjogren syndrome accompanying pulmonary amyloidosis and lymphoproliferative disease and to compare these with histopathologic findings. SUBJECTS AND METHODS:The thin-section CT findings of 5 women (age range: 42-59 years, mean age=50 years) wi...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200411000-00008
更新日期:2004-11-01 00:00:00
abstract:PURPOSE:To investigate the optimal dual-energy reconstruction technique for the visualization of the hepatic arterial system during dual-energy multidetector computed tomographic (MDCT) angiography of the liver. MATERIALS AND METHODS:Twenty-nine nonconsecutive patients underwent dual-energy MDCT angiography of the liv...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0000000000000259
更新日期:2015-09-01 00:00:00
abstract::Early studies evaluating the utility of Gd-diethylenetriamine pentaacetic acid (DTPA) enhanced MR imaging for characterization of musculoskeletal masses have demonstrated inconsistent and often conflicting results. In this study a new method, dynamic Gd-DTPA enhanced rapid acquisition spin echo MR imaging, was impleme...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:
更新日期:1992-01-01 00:00:00
abstract::The effect of hemodialysis on the CT absorption value of the liver was examined in 14 hemodialysis patients. In the high ultrafiltration group [10 patients with a weight loss of -1.7 to -3.5 (2.9 +/- 0.6) kg], the hepatic CT absorption value increased from 49.6 +/- 7.0 to 58.7 +/- 8.7 Hounsfield units (p less than 0.0...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198408000-00021
更新日期:1984-08-01 00:00:00
abstract:OBJECTIVE:To investigate the effect of iodinated contrast medium on sulcal hyperintensity on fluid-attenuated inversion recovery (FLAIR) imaging immediately after intra-arterial thrombolysis in patients with acute ischemic stroke and to determine whether it may be associated with subsequent hemorrhagic transformation (...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/01.rct.0000155669.05643.49
更新日期:2005-03-01 00:00:00
abstract::Pick's disease is a rare cause of dementia. It often shows a characteristic pattern of atrophy affecting primarily the anterior portions of the frontal and temporal lobes. This pattern, as shown by computed tomography, may suggest the diagnosis. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-197902000-00021
更新日期:1979-02-01 00:00:00
abstract::A soft tissue mass close to the upper pole of the left kidney was noted in a patient referred for intravenous pyelography. A left adrenal tumor was suspected. Computed tomography, however, revealed an accessory spleen. The diagnosis was confirmed by abdominal angiography. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198008000-00028
更新日期:1980-08-01 00:00:00
abstract::Magnetic resonance imaging was evaluated in six patients with primary thyroid lymphoma. Five patients had a solitary localized tumor and one had multiple tumors. These masses showed homogeneous iso- or high intensity compared with the uninvolved thyroid tissue on T1-weighted images and homogeneous high intensity on T2...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199107000-00019
更新日期:1991-07-01 00:00:00
abstract::An increase in the effective atomic number of blood is among the factors allowing or influencing the visualization of the major cerebral vessels on noncontrast CT. Bromine (atomic number, 50) attenuates 70 keV X-rays significantly and was responsible for a striking enhancement of the major cerebral vessels on the nonc...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198410000-00035
更新日期:1984-10-01 00:00:00
abstract::Magnetic resonance imaging of the larynx was performed on 15 volunteers. Searching for optimal images in the sagittal, frontal, and transverse planes, we compared images made with a special surface coil and the standard head coil, images with different slice thicknesses, images with different repetition times (TR) and...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198509000-00015
更新日期:1985-09-01 00:00:00
abstract:OBJECTIVE:This study aimed to observe the value of computed tomography (CT) spectral imaging parameters in the diagnosis of solitary pulmonary nodules, during the contrast-enhanced early phase and late phase. MATERIALS AND METHODS:This study was approved by the institutional review board and written informed consent w...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0000000000000469
更新日期:2016-11-01 00:00:00