Abstract:
RATIONALE AND OBJECTIVES:To investigate postmortem metabolic and morphologic alterations in the dog brain thalamus and to contribute diagnostic aids in medicolegal science. METHODS:A homogeneous group of 17 dogs was used for in vivo 1H magnetic resonance (MR) spectroscopy and electron microscopic studies, which were performed under intravenous and intramuscular anesthesia before and after the dogs were killed. All 1H MR spectroscopy and electron microscopy examinations were performed on a 1.5 T MR imaging/MR spectroscopy system using a stimulated-echo acquisition mode pulse sequence and an electron microscope, respectively. RESULTS:The lactate resonance signal, which could be used as a criterion for tissue survival, appeared during the entire postmortem period. The lactate: creatine ratio significantly increased in the early postmortem metabolic process. The inositol: creatine ratio showed a mild gradual increase. However, the N-acetyl-aspartate: creatine and choline/creatine ratios generally were unchanged. The decomposition of proton metabolites was observed in the MR spectrum 48 hours postmortem. In the postmortem period, high power field (x10,000) electron microscopic results showed significant morphologic alterations of the thalamus, revealing nuclear pyknosis and perikaryal condensation, cytoplasmic vacuoles, clumping of nuclear chromatin, and destruction of cellular organelles and nuclear membrane. CONCLUSIONS:Results suggest that the combination of 1H MR spectroscopy and electron microscopy may simultaneously provide good quality metabolic and morphologic information of cerebral tissue in the field of thanatochronology.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Choe BY,Gil HJ,Suh TS,Shinn KSdoi
10.1097/00004424-199505000-00001subject
Has Abstractpub_date
1995-05-01 00:00:00pages
269-74issue
5eissn
0020-9996issn
1536-0210journal_volume
30pub_type
杂志文章abstract:RATIONALE AND OBJECTIVES:The authors investigated whether gadolinium-ethoxybenzyl-DTPA (Gd-EOB-DTPA) can be eliminated in the absence of the two usual excretory pathways (urinary or biliary) and whether a remaining excretory pathway is able to compensate for impaired liver or kidney function. METHODS:The study was per...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199402000-00017
更新日期:1994-02-01 00:00:00
abstract:OBJECTIVE:There is little published information regarding the efficacy of paclitaxel-coated balloon catheters except for the iopromide-containing formulation, and less is known about the kind of toxicity at overdose. The aim of our study was to assess 2 different paclitaxel matrix formulations on angioplasty balloon ca...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31820577df
更新日期:2011-04-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to develop and verify a method to obtain good temporal resolution T2-weighted 4-dimensional (4D-T2w) magnetic resonance imaging (MRI) by using motion information from T1-weighted 4D (4D-T1w) MRI, to support treatment planning in MR-guided radiotherapy. MATERIALS AND METHODS:Ten pat...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000381
更新日期:2017-10-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors used gadolinium (Gd) chelate as a T1, T2, and T2* enhancing agent in reperfused myocardial infarction to compare the appearance of reperfused myocardial infarction on spin echo and gradient echo magnetic resonance (MR) sequences. METHODS:Rats (n = 28) were subjected to reperfused m...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199807000-00002
更新日期:1998-07-01 00:00:00
abstract::The biliary and urinary excretion of sodium tyropanoate (Bilopaque) and sodium ipodate (Oragrafin) were studied in unanesthetized bile-fistula dogs using stepwise, increasing, intravenous infusions of the contrast materials. A constant intravenous infusion of sodium taurocholate was administered at the rate of either ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197701000-00017
更新日期:1977-01-01 00:00:00
abstract:OBJECTIVES:The aims of this study were to investigate and validate quantitative susceptibility mapping (QSM) for lesional iron quantification in cerebral cavernous malformations (CCMs). MATERIALS AND METHODS:Magnetic resonance imaging studies were performed in phantoms and 16 patients on a 3-T scanner. Susceptibility ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000043
更新日期:2014-07-01 00:00:00
abstract::Comparatively new in the roentgen evaluation of infants and children, xerography would appear to be ideal for portraying the pediatric airway. Since the radiation dose of xerography is higher than conventional radiography, its image quality is the subject of careful scrutiny in a pediatric setting here described in 23...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197807000-00002
更新日期:1978-07-01 00:00:00
abstract:RATIONAL AND OBJECTIVES:Magnetic resonance (MR) scan technique and lesion detectability were evaluated using a newly developed spinal abscess model in the New Zealand White rabbit. METHODS:To create the lesion, an epidural needle was inserted under fluoroscopic guidance in the lumbar region and advanced to penetrate t...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199804000-00008
更新日期:1998-04-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To develop a simple and robust helium3 polarization system dedicated to small animal imaging. To demonstrate the potential of helium3 imaging for pulmonary ventilation and perfusion studies. METHODS:A home-built polarization system based on spin-exchange technique was used. This system was app...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:2003-06-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000362
更新日期:2017-07-01 00:00:00
abstract::The Point Spread Function (PSF) in NMR imaging is the result of both the line broadening due to magnet field inhomogeneity and the intrinsic spectrum of the nucleus at resonance. In the case of proton imaging, the line broadening dominates the small chemical shifts and the spectral lines are not resolved. This is not ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198503000-00016
更新日期:1985-03-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:A new hepatobiliary gadolinium chelate, gadolinium (Gd) 2,5-BPA-DO3A, was compared in two animal species with Gd HP-DO3A (gadoteridol), a clinically approved extracellular contrast agent, and Gd Cy2-DOTA, a second hepatobiliary chelate in preclinical development. The ligand in Gd 2,5-BPA-DO3A i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199601000-00003
更新日期:1996-01-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Magnetic resonance imaging (MRI) techniques seem to be very promising for 3D dosimetry studies, but long imaging acquisition time limits their use. A new fast T1 mapping protocol, easy to implement on a conventional MR imager, has been used to determine dose distributions on Fricke gels. METHO...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199903000-00014
更新日期:1999-03-01 00:00:00
abstract:PURPOSE:The relaxivities of 3 macrocyclic gadolinium-based contrast agents (GBCAs) were determined in human plasma and blood under standardized and clinically relevant laboratory conditions. METHODS:The T1 relaxivity, r1, was determined in human plasma at 1.5, 3, and 7 T, and in human blood at 3 T at 37°C in phantoms ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000577
更新日期:2019-09-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198411000-00024
更新日期:1984-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:This study sought to evaluate prospectively the diagnostic potential of unenhanced and enhanced color Doppler and power Doppler for the differentiation of tumors and tumorlike lesions of the breast. METHODS:Ninety-two patients with 110 tumors or tumorlike lesions of the breast were investigate...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199902000-00003
更新日期:1999-02-01 00:00:00
abstract::We evaluated the density distribution (anterior-posterior) of the right lung in 19 acutely anesthetized supine dogs using computed transmission tomography (CTT). Eleven dogs served as controls, and eight received 0.12 cc/kg of intravenously administered oleic acid. The latter were sequentially imaged over 1 hour. Nine...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1984-05-01 00:00:00
abstract:OBJECTIVE:The aim of the study was to assess the value of in vivo T2 measurements to noninvasively quantify myocardial fibrosis in diabetic mice at 11.75 T. Diabetic cardiomyopathy is characterized by extracellular matrix alteration and microcirculation impairment. These conditions might provide electrical heterogeneit...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e318243e062
更新日期:2012-05-01 00:00:00
abstract::The purpose of our investigation was to determine whether iopanoyl glucuronide, the major metabolite of iopanoic acid (Telepaque), undergoes hydrolysis by bacterial beta-glucuronidase in dogs. The conjugated compound was identified and quantitated by elemental analysis, fluorescent excitation analysis, thin-layer chro...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197805000-00011
更新日期:1978-05-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To develop a new animal model for the evaluation of the renal tolerance of contrast agent and its application to diatrizoate and iotrolan injections in comparison to saline and mannitol solution. MATERIALS AND METHODS:The nephrotoxic potential of intravenously injected contrast agents in Beagl...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000087096.61127.13
更新日期:2003-11-01 00:00:00
abstract:PURPOSE:The aim of this study was to develop a method to delineate the lethally frozen-tissue region (temperature less than -40°C) arising from interventional cryoablation procedures using a short tau inversion-recovery ultrashort echo-time (STIR-UTE) magnetic resonance (MR) imaging sequence. This method could serve as...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000642
更新日期:2020-05-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000459
更新日期:2018-10-01 00:00:00
abstract:PURPOSE:To determine the reproducibility, accuracy, and predictors of accuracy of computed tomography (CT) angiography to detect and characterize coronary atherosclerotic plaque as compared with intravascular ultrasound. METHODS:Ten ex vivo human coronary arteries were imaged in a moving phantom by dual-source CT (col...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181e0a541
更新日期:2010-11-01 00:00:00
abstract::Surgical resection is the standard of care for colorectal metastases isolated to the liver. However, only 10-25% of the patients are eligible for resection because of extent and location of the disease in the liver or concurrent medical conditions. Image-guided radiofrequency (RF) ablation is a minimally invasive tech...
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:10.1097/00004424-200411000-00007
更新日期:2004-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The vascular opacification characteristics of a new nonionic, dimeric contrast agent, iodixanol, have been compared with a nonionic, monomeric agent, iohexol, using ultrafast computed tomography (UFCT). METHODS:In 10 experiments with mongrel dogs, the contrast agents were alternately injected ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199212000-00011
更新日期:1992-12-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors determine the relative effect of soft-tissue compartments, body fat (percent [%Bfat] and weight [Bfat kg]) and fat-free mass (FFM kg), on measurements of ultrasound bone velocity (UBV m/second). METHODS:The authors measured UBV in proximal phalanxes and body fat and fat-free mass b...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199710000-00005
更新日期:1997-10-01 00:00:00
abstract:PURPOSE:The aim of this study was to identify the signal intensity (SI) changes in the dentate nucleus (DN) and the globus pallidus (GP) on unenhanced T1-weighted magnetic resonance (MR) images after multiple administration of gadolinium-based contrast agents (GBCAs) in children and compare those changes between linear...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000436
更新日期:2018-04-01 00:00:00
abstract::The retropsoas recess, a previously undescribed normal anatomic variant, is reported. In most individuals, the space posterior to the belly of the psoas muscle contains fat within the posterior pararenal space. However, a retrospective review of 250 consecutive CT examinations of the abdomen revealed 11 cases (4.4%) i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198707000-00004
更新日期:1987-07-01 00:00:00
abstract::The contrast sensitivity of the retina is greatest in the center and decreases rapidly toward the periphery. Therefore, the detection of low-contrast lung nodules depends upon the manner in which the image is sampled by retinal receptors as eye fixations jump across the image during scanning. The scanning performance ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198705000-00010
更新日期:1987-05-01 00:00:00
abstract::The rates at which the paramagnetic compounds deoxyhemoglobin (Hb) and methemoglobin (MHb) form in vivo within an area of hemorrhage are unknown. The present experiment establishes the baseline concentrations and rates of change in paramagnetic hemoglobin concentrations, as well as the pH in normal heparinized and clo...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199003000-00006
更新日期:1990-03-01 00:00:00