Abstract：
PURPOSE:To acquire ultra high resolution MRI images of the human brain at 8 Tesla within a clinically acceptable time frame. METHOD:Gradient echo images were acquired from the human head of normal subjects using a transverse electromagnetic resonator operating in quadrature and tuned to 340 MHz. In each study, a group of six images was obtained containing a total of 208 MB of unprocessed information. Typical acquisition parameters were as follows: matrix = 2,000 x 2,000, field of view = 20 cm, slice thickness = 2 mm, number of excitations (NEX) = 1, flip angle = 45 degrees, TR = 750 ms, TE = 17 ms, receiver bandwidth = 69.4 kHz. This resulted in a total scan time of 23 minutes, an in-plane resolution of 100 microm, and a pixel volume of 0.02 mm3. RESULTS:The ultra high resolution images acquired in this study represent more than a 50-fold increase in in-plane resolution relative to conventional 256 x 256 images obtained with a 20 cm field of view and a 5 mm slice thickness. Nonetheless, the ultra high resolution images could be acquired both with adequate image quality and signal to noise. They revealed numerous small venous structures throughout the image plane and provided reasonable delineation between gray and white matter. DISCUSSION:The elevated signal-to-noise ratio observed in ultra high field magnetic resonance imaging can be utilized to acquire images with a level of resolution approaching the histological level under in vivo conditions. However, brain motion is likely to degrade the useful resolution. This situation may be remedied in part with cardiac gating. Nonetheless, these images represent a significant advance in our ability to examine small anatomical features with noninvasive imaging methods.
journal_name
J Comput Assist Tomogrjournal_title
Journal of computer assisted tomographyauthors
Robitaille PM,Abduljalil AM,Kangarlu Adoi
10.1097/00004728-200001000-00002keywords:
subject
Has Abstractpub_date
2000-01-01 00:00:00pages
2-8issue
1eissn
0363-8715issn
1532-3145journal_volume
24pub_type
杂志文章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：:We present the case of unilateral nonhemorrhagic adrenal infarct in a 29-week pregnant 21-year-old woman. The patient presented with right upper quadrant pain, nausea, and vomiting. Ultrasonography of the right upper quadrant and appendix was negative for pathology. Magnetic resonance imaging of the abdomen demonstrat...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/RCT.0000000000000887
更新日期：2019-11-01 00:00:00
abstract：:Our retrospective study of 230 computed tomographic (CT) studies of hepatic masses yielded 28 cases (12.2%) which contained calcification. Calcific deposits were noted in 9 of 59 patients (15.3%) with hepatocellular carcinoma (HCC), 15 of 82 patients (18.3%) with liver metastases from colorectal carcinoma (MCRC), 2 of...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198302000-00015
更新日期：1983-02-01 00:00:00
abstract：:Mean lung density (MLD), as determined by a chest computed tomographic sector method, was evaluated in 12 patients with sarcoidosis and diffuse interstitial lung disease. The results demonstrate that MLD in sarcoidosis was -610.9 +/- 57.3 Hounsfield units (HU), significantly different (p less than 0.001) from a contro...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198306000-00003
更新日期：1983-06-01 00:00:00
abstract：:Two cases of von Recklinghausen neurofibromatosis (VRN) with thoracic and abdominal involvement are described. Computed tomography demonstrated the typical lesions of this disease: meningoceles, neurofibromas, and skeletal alterations. In both cases lesion morphology and location were similar and characteristic, in pa...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198310000-00021
更新日期：1983-10-01 00:00:00
abstract：:Seven patients with polypoid mucoceles of the ethmoid sinuses were examined by computed tomography (CT). The findings in all cases were remarkably similar. This unique CT appearance has not been seen with malignancies and should be considered characteristic of this benign entity. ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198208000-00010
更新日期：1982-08-01 00:00:00
abstract：OBJECTIVE:To determine the incremental detection rate of clinically significant prostate cancer (csPCa) provided by sequential cores during in-bore magnetic resonance imaging (MRI)-guided prostate biopsies. METHODS:Single-center, retrospective interpretation of prospectively acquired data in men without previous diagn...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/RCT.0000000000001115
更新日期：2020-12-02 00:00:00
abstract：:Osteoid osteoma is a benign osteoblastic tumor usually diagnosed by conventional radiography. Computed tomography can be used preoperatively to localize the nidus and avoid unnecessary or misdirected resection. In this report CT appearance of the nidus in osteoid osteoma versus sequestration in osteomyelitis is presen...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：
更新日期：1986-05-01 00:00:00
abstract：OBJECTIVE:To compare the diagnostic performance of adaptive statistical iterative reconstruction applied low-dose computed tomography (CT) (LDCT) with that of the standard-dose CT (SDCT) for local recurrence in patients with stomach cancer. METHODS:Seventy-nine consecutive patients who had undergone surgical resection...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章,随机对照试验
doi：10.1097/RCT.0000000000000057
更新日期：2014-05-01 00:00:00
abstract：OBJECTIVE:To assess the feasibility of a time-efficient, high-resolution magnetic resonance lymphangiography (HR MRL) protocol without image subtraction for the detection of lymphatic vessels in patients with primary and secondary lymphedema. METHODS:Three consecutive patients with lymphedema of the lower extremities ...
journal_title：Journal of computer assisted tomography
pub_type： 临床试验,杂志文章
doi：10.1097/01.rct.0000237814.33925.32
更新日期：2007-03-01 00:00:00
abstract：PURPOSE:This study aimed to investigate the effectiveness and additive value of T2W 3-dimensional sampling perfection with application optimized contrast (3D-SPACE) with variant flip-angle mode in imaging of all types of hydrocephalus. Our secondary objective was to assess the reliability of 3D-SPACE sequence and corre...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/RCT.0000000000000206
更新日期：2015-05-01 00:00:00
abstract：:A 3% barium paste was used in the CT evaluation of 100 normal and 60 abnormal esophagi. Successful esophageal opacification occurred in 87% of both groups. In cases of extrinsic disease involving the esophagus the contrast medium administration assisted in separating the esophagus from adjacent mass lesions, as well a...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198803000-00004
更新日期：1988-03-01 00:00:00
abstract：:The design of a high resolution positron emission tomograph is described. The scanner has four rings of detectors with an inside diameter of 38 cm and produces seven simultaneous slices, including three cross-slices. Each ring contains 128 bismuth germanate scintillation detectors with dimensions of 8.25 x 20 x 35 mm;...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198002000-00002
更新日期：1980-02-01 00:00:00
abstract：:Magnetic resonance elastography (MRE) has been successfully implemented in the assessment of diffuse liver diseases. Currently, MRE is the most accurate noninvasive technique for detection and staging of liver fibrosis with a potential to replace liver biopsy. Magnetic resonance elastography is able to differentiate i...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章,评审
doi：10.1097/RCT.0000000000000032
更新日期：2013-11-01 00:00:00
abstract：:Proton MR spectroscopy of the brain has been undertaken in 8 healthy volunteers and in 11 patients with human immunodeficiency virus infection and varying stages of AIDS dementia complex (ADC). Spectral appearances in patients with no ADC or early ADC were not significantly different from normal volunteers. Spectra fr...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199207000-00007
更新日期：1992-07-01 00:00:00
abstract：OBJECTIVE:Paroxysmal nocturnal hemoglobinuria (PNH) is an acquired hemolytic disorder, characterized by hemosiderin deposition in the proximal renal tubules. MATERIALS AND METHODS:We examined six cases of PNH with MRI including gradient echo imaging. RESULTS:On T2- and T2*-weighted imaging a characteristic hypointens...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199309000-00016
更新日期：1993-09-01 00:00:00
abstract：:Benign hepatic neoplasms constitute a heterogeneous group of neoplasms with characteristic histology and variable tumor biology. Based on the cell of origin, benign hepatic neoplasms are classified into epithelial, nonepithelial, and miscellaneous categories according to the 2000 World Health Organization classificati...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章,评审
doi：10.1097/RCT.0b013e31815a5748
更新日期：2008-11-01 00:00:00
abstract：PURPOSE:Quantitative measurement of change in brain size and shape (e.g., to estimate atrophy) is an important current area of research. New methods of change analysis attempt to improve robustness, accuracy, and extent of automation. A fully automated method has been developed that achieves high estimation accuracy. ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-200105000-00022
更新日期：2001-05-01 00:00:00
abstract：:The article presents a case of subacute coronary artery thrombosis investigated by classic methods, coronary angiography, and MRI. T1- and T2-weighted images showed high signal intensity within the lumen of the right coronary artery corresponding to the methemoglobin content of the thrombus. Dynamic sequence images wi...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199711000-00020
更新日期：1997-11-01 00:00:00
abstract：:An assessment of the role of marrow fat as a source of error in single energy quantitative CT (SEQCT) measurements of the spine is presented. Fat-induced shifts and spreads in SEQCT findings are discriminated and quantified. Studies using chemical analysis have reported an average vertebral bone mineral (MIN) loss of ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198911000-00015
更新日期：1989-11-01 00:00:00
abstract：:Magnetic resonance was performed in five patients with obstructive hydrocephalus due to surgically proven colloid cyst of the third ventricle. On T1-weighted images two lesions were homogeneously hyperintense and another homogeneously isointense with the surrounding brain parenchyma. On T2-weighted images these three ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199007000-00005
更新日期：1990-07-01 00:00:00
abstract：OBJECTIVE:Our goal was to evaluate the role of Gd-enhanced MR in the diagnosis and surgical planning of intraventricular cysticercosis cysts. MATERIALS AND METHODS:Thirty-three patients with intraventricular cysticercosis were evaluated with Gd-enhanced MRI including follow-up studies ranging over time periods from 6 ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199311000-00015
更新日期：1993-11-01 00:00:00
abstract：:Intracranial opportunistic infections have been widely reported in patients with acquired immune deficiency syndrome (AIDS). We report an unusual presentation of Toxoplasma gondii infection in a patient with AIDS. ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198503000-00033
更新日期：1985-03-01 00:00:00
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. METH...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/RCT.0b013e3181e66473
更新日期：2010-09-01 00:00:00
abstract：:We report an unusual case of diffuse infiltration of the mesentery by amyloidosis. The CT, sonographic, and operative findings mimicked abdominal carcinomatosis. ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：
更新日期：1985-01-01 00:00:00
abstract：OBJECTIVE:To capture 3D shape variation of the levator ani during straining with open access MR imaging. METHODS:Optimal scan-planning based on statistical shape modeling is developed for recovering the entire 3D structure of the levator ani from a limited number of 2D imaging planes. Statistical shape modeling ensure...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/01.rct.0000155076.42784.ed
更新日期：2005-03-01 00:00:00
abstract：OBJECTIVE:The purpose of this study was to evaluate the image quality and radiation dose of computed tomography (CT) coronary angiography using a 256-row detector CT scanner in a single cardiac cycle in patients with atrial fibrillation (AF). METHODS:Seventy consecutive patients (41 men and 29 women; age range was fro...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/RCT.0000000000000683
更新日期：2018-03-01 00:00:00
abstract：:We describe a case of a ruptured gravid uterus, secondary to motor vehicle accident, in a 20-year-old woman. Maternal and fetal injuries associated with blunt trauma are described along with the use of CT in pregnant patients. ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-199103000-00030
更新日期：1991-03-01 00:00:00
abstract：PURPOSE:The purpose of this study was to assess the accuracy of magnetic resonance imaging (MRI), particularly, dynamic MRI, in distinguishing ovarian fibromas from subserous uterine leiomyomas. MATERIAL AND METHODS:Fifteen ovarian fibromas and 15 subserous uterine leiomyomas were retrospectively reviewed. All MR exam...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/01.rct.0000237810.88251.9e
更新日期：2007-03-01 00:00:00
abstract：:Computed tomography of the liver was performed on two patients with subacute hepatitis. The CT findings included the presence of multiple regenerative nodules in the atrophied liver, shown by decreased CT attenuation. Complications due to hepatitis, such as massive ascites and splenomegaly, were also observed. The CT ...
journal_title：Journal of computer assisted tomography
pub_type： 杂志文章
doi：10.1097/00004728-198907000-00016
更新日期：1989-07-01 00:00:00
