Abstract:
OBJECTIVE:The purpose of this study was to evaluate the usefulness of z-score mapping method on neuroradiologists' performance in quantification of the extent of hypoattenuation regions of hyperacute stroke on unenhanced computed tomographic (CT) images by using the Alberta Stroke Programme Early CT Score system. METHODS:Twenty-one patients with infarction (<3 hours) were retrospectively selected. Five neuroradiologists interpreted CT images first without and then with z-score maps by using the Alberta Stroke Programme Early CT Score system. Their performances in the quantification of the extent of hypoattenuation were compared. RESULTS:Average accuracies for the quantification without and with the z-score maps were 82.6% and 86.6%, respectively (P < 0.0001). The average area under the receiver operating characteristic curve for detection of focal hypoattenuation significantly increased from 0.883 to 0.925 (P = 0.01) by use of z-score maps. CONCLUSIONS:The use of z-score mapping method has the potential to help neuroradiologists quantify the extent of hypoattenuation regions of hyperacute stroke on unenhanced CT images.
journal_name
J Comput Assist Tomogrjournal_title
Journal of computer assisted tomographyauthors
Takahashi N,Tsai DY,Lee Y,Kinoshita T,Ishii K,Tamura H,Takahashi Sdoi
10.1097/RCT.0b013e3181e66473subject
Has Abstractpub_date
2010-09-01 00:00:00pages
751-6issue
5eissn
0363-8715issn
1532-3145pii
00004728-201009000-00018journal_volume
34pub_type
杂志文章abstract::The anatomy of 60 right and 80 left normal suprarenal (adrenal) glands in 90 patients was studied. In the transaxial view, the glands have a triradiate shape, which varies on serial sections. The medial posterior limbs of each gland were visualized on the more cranial sections. The transaxial positions of the glands a...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-197801000-00001
更新日期:1978-01-01 00:00:00
abstract:OBJECTIVE:The purpose of this study was to investigate the early manifestation of hypervascular hepatocellular carcinomas by means of evaluating the "nodule-in-nodule" hepatic lesions depicted on dynamic computed tomography. METHODS:For 26 lesions with hypervascular foci in nonhypervascular nodules in 23 patients with...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e3181670fa3
更新日期:2009-01-01 00:00:00
abstract::Computed tomography provides excellent visualization of the trachea, but there have been only limited descriptions of variations in tracheal shape. The normal tracheal cartilage is U shaped. Lunate shaped trachea is uncommon and is characterized by a coronal/sagittal diameter ratio (tracheal index) greater than 1. We ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198905000-00033
更新日期:1989-05-01 00:00:00
abstract:OBJECTIVE:We compared MRI with two-dimensional echocardiography (2dE) and Doppler echocardiography to determine the diagnostic role of MRI in hypertrophic cardiomyopathy (HCM). MATERIALS AND METHODS:Twenty-three patients with 2dE diagnosis of HCM were examined with MRI; 12 of 23 patients were also studied by color (cD...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199311000-00005
更新日期:1993-11-01 00:00:00
abstract::Perineural spread along the nasociliary branch of the ophthalmic nerve has not been previously described, to our knowledge. One case of cutaneous squamous carcinoma at the medial canthus and another of melanoma of the nasal ala, with nasociliary nerve perineural spread, are illustrated here. Whereas magnetic resonance...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e31827cd39e
更新日期:2013-03-01 00:00:00
abstract::We aim to review the imaging appearance of peripheral nerve sheath tumors (PNSTs) of head and neck according to updated fourth edition of World Health Organization classification. Peripheral nerve sheath tumor can be sporadic or associated with neurofibromatosis type 1, neurofibromatosis type 2, and schwannomatosis. S...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章,评审
doi:10.1097/RCT.0000000000001109
更新日期:2020-11-01 00:00:00
abstract::Complete duplication of the pituitary gland is an extremely rare condition which is associated with a wide range of anomalies. An incomplete duplication affecting only the anterior pituitary gland or the pituitary stalk has not been described so far. We report 2 such cases of partial duplication of the hypophysis and ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/01.rct.0000243458.08061.f1
更新日期:2007-05-01 00:00:00
abstract::Several classification systems for neuroendocrine tumors (NETs) exist, which use variable terminology and criteria for grading and staging. This variability in terminology can cause confusion and difficulty in recognizing which tumors are, in fact, members of this heterogeneous group of malignancies. The largest group...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章,评审
doi:10.1097/RCT.0000000000000140
更新日期:2014-11-01 00:00:00
abstract::A case of a huge intracranial frontoparietal osteochondroma in a 20-year-old man is reported. The presenting symptoms were headache, vomiting, and blurred vision. Apart from papilledema, no other abnormal neurological signs were present. A specific preoperative diagnosis could not be reached from the information provi...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198102000-00022
更新日期:1981-02-01 00:00:00
abstract:OBJECTIVE:To evaluate the effect of gadolinium ethoxybenzyl diethylenetriaminepentaacetic acid (Gd-EOB-DTPA) on T2-weighted magnetic resonance imaging of liver parenchyma. METHODS:Forty-six patients with suspected hepatic tumors (group 1) underwent breath-hold T2-weighted fast spin echo imaging before and after 4 minu...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e3181bc961b
更新日期:2010-03-01 00:00:00
abstract:PURPOSE:To identify computed tomographic (CT) findings that distinguish perirenal liposarcomas from exophytic angiomyolipomas. MATERIALS AND METHODS:We identified CT scans of 20 patients (13 women and 7 men; mean age, 63 years) with either perirenal liposarcoma (n = 11) proven at histopathology or large exophytic angi...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e3181507534
更新日期:2008-07-01 00:00:00
abstract:OBJECTIVE:To investigate the magnetic resonance imaging (MRI) features of well-differentiated hepatocellular carcinoma (HCC). METHODS:We reviewed the MRI of 32 patients with 33 pathologically confirmed well-differentiated HCC. The MRI protocol included T2-weighted imaging with and without fat saturation, dual-phase T1...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200607000-00008
更新日期:2006-07-01 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
abstract:OBJECTIVE:Magnetic resonance imaging has proven to be a useful diagnostic tool for the evaluation of various types of vascular rings and congenital heart disease. We report two cases showing the accuracy of MRI in detecting post-surgical complications in patients with these conditions. MATERIALS AND METHODS:The two ca...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199401000-00008
更新日期:1994-01-01 00:00:00
abstract::Weighting is the term most frequently used to describe magnetic resonance pulse sequences and the concept most commonly used to relate image contrast to differences in magnetic resonance tissue properties. It is generally used in a qualitative sense with the single tissue property thought to be most responsible for th...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章,评审
doi:10.1097/RCT.0b013e3181d3449a
更新日期:2010-05-01 00:00:00
abstract::Focal nodular hyperplasia (FNH) is a benign hepatic lesion characterized by homogeneous enhancement following intravenous contrast. The authors report a patient with a markedly heterogeneous FNH due to extensive intratumoral fat. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章,评审
doi:10.1097/00004728-200209000-00025
更新日期:2002-09-01 00:00:00
abstract::We describe a case of disruption of the blood-brain barrier (BBB) by nonionic, low osmolality contrast medium after abdominal angiography. One plausible explanation of this event is that acute hypertension during angiography may have increased the BBB permeability, allowing the contrast medium to leak across it. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198909000-00027
更新日期:1989-09-01 00:00:00
abstract::Computed tomographic and magnetic resonance (MR) findings in a case of pseudomyxoma peritonei arising from a mucoid cystadenoma of the ovary are presented. The possible diagnostic aid of MR is discussed. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198511000-00025
更新日期:1985-11-01 00:00:00
abstract::Fifteen patients with 21 subdural effusions were investigated both with transmission computer assisted tomography (CAT) and positron emission tomography (PET). The tracer in the emission studies was 68Ga-EDTA. Twelve lesions were visualized both with CAT and PET. Five lesions that were negative or doubtful on CAT were...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198012000-00002
更新日期:1980-12-01 00:00:00
abstract:PURPOSE:The purpose of this work was to determine the sensitivity of hepatic digital subtraction arteriography (DSA) for the detection of hepatocellular carcinoma (HCC) and dysplastic nodules (DNs) when compared with pathological findings from whole liver explants. METHOD:Twenty-one patients 30-72 years old (mean 54 y...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200007000-00022
更新日期:2000-07-01 00:00:00
abstract:OBJECTIVE:The purpose of this article is to report computed tomography demonstration of medial bowing of the lamina papyracea in 5 patients after internal ethmoidectomy. METHODS:We identified 5 patients who had apparent medial bowing of the lamina papyracea after functional endoscopic sinus surgery (FESS) and who had ...
journal_title:Journal of computer assisted tomography
pub_type: 临床试验,杂志文章
doi:10.1097/RCT.0b013e31816c82da
更新日期:2009-01-01 00:00:00
abstract::Neutrons and X-rays are mathematically equivalent as probes in computed tomography. However, structure in the energy dependence of neutron total cross sections and the feasibility of using time-of-flight techniques for energy sensitivity in neutron detection suggest that spatial distributions of specific substances ca...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-198302000-00021
更新日期:1983-02-01 00:00:00
abstract::Magnetic resonance imaging depicts the morphological details of the female pelvis and is useful for evaluating both benign and malignant cervical masses. Clinical assessment of the extent of cervical cancer is crucial in determining the optimal treatment strategy, but clinical staging by itself has limitations. Clinic...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/RCT.0b013e3181ed3090
更新日期:2010-11-01 00:00:00
abstract::The central dot sign on CT in Caroli disease has been described previously. We describe a patient with the central dot sign who had periductal cysts but did not have Caroli disease. ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199011000-00034
更新日期:1990-11-01 00:00:00
abstract:PURPOSE:Our goal was to demonstrate the appearance of phantom tastes and smells (phantageusia and phantosmia, respectively) by use of functional MRI (fMRI) of the brain and to demonstrate the efficacy of drug treatment that inhibited both the subjective presence of these phantoms and the fMRI brain activation initiated...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200001000-00022
更新日期:2000-01-01 00:00:00
abstract:OBJECTIVE:We compared body coil (BC) MR images and endorectal surface coil (ERC) images with respect to the visualization of the cervix and adjacent tissues and the histopathologic correlations of the imaging findings. MATERIALS AND METHODS:Twenty-one patients with cervical carcinoma underwent MRI using both coils for...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::Bullous lung disease is known to be a risk factor for developing a bronchogenic carcinoma. In this article, computed tomography appearances of 20 patients with histologically proven bronchogenic carcinoma were reviewed retrospectively. On the basis of the previous literatures and our findings, the computed tomography ...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200605000-00016
更新日期:2006-05-01 00:00:00
abstract::The goal of neuro-oncologic surgery is to maximize tumor resection while preserving vital brain functions. Identification of the relation between the tumor and adjacent functional cortical areas as well as efferent subcortical white matter tracts is important for preservation of function. Combined diffusion tensor ima...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-200407000-00019
更新日期:2004-07-01 00:00:00
abstract::The density distribution inside a pathologic zone before and after contrast enhancement has been studied in the computed tomograms of 88 cases of cerebral and orbital tumors, using histographic analysis. The histograms provided additional diagnostic information, especially for vascular tumors. This method is also usef...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-197704000-00014
更新日期:1977-04-01 00:00:00
abstract:OBJECTIVE:Our goal was to clarify the ability of CT to evaluate intramural invasion of gastric cancer. MATERIALS AND METHODS:We reviewed bolus-enhanced CT images performed with orally administered 400-600 ml of water in 59 early gastric cancers and 22 advanced gastric cancers mimicking early gastric cancers macroscopi...
journal_title:Journal of computer assisted tomography
pub_type: 杂志文章
doi:10.1097/00004728-199511000-00019
更新日期:1995-11-01 00:00:00