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. METHODS:The method has been tested on manganese chloride (MnCl2) doped ferrous gelatin gels. The T1 measuring times range from 1 minute 40 seconds to 3 minutes 30 seconds for a 256x256 matrix image. RESULTS:The two- and three-dimensional profiles agree with those obtained with conventional dosimetry techniques (ion chambers). The precision and the spatial resolution principally depend on the signal-to-noise ratio of the used imaging RF coil. For example, for a surface coil, the accuracy is about 2.5% with a 1.56 mm spatial resolution. CONCLUSION:These preliminary results support the feasibility of the proposed technique for accurate MRI dosimetry studies and also have potential for various clinical quantitative MRI applications.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Calmet C,Vincensini D,Bonnet J,Bertino C,Catala A,Martinez M,Joffre Fdoi
10.1097/00004424-199903000-00014keywords:
subject
Has Abstractpub_date
1999-03-01 00:00:00pages
236-41issue
3eissn
0020-9996issn
1536-0210journal_volume
34pub_type
杂志文章abstract:RATIONALE AND OBJECTIVES:To evaluate the role of granulocytes in reperfusion injury after liver transplantation. The authors injected radiolabeled granulocytes to determine if human liver graft outcome could be correlated with granulocyte accumulation. MATERIALS AND METHODS:Pure granulocyte suspension was prepared fro...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199603000-00003
更新日期:1996-03-01 00:00:00
abstract::The effects of edge gradient and blur on the detection pulmonary nodules were studied, using a test series of 175 artificial nodules on 30 chest films. The nodules were of homogeneous texture, about 1 cm in diameter and had a mean contrast of .12. Six observers viewed the film set, scoring both location and confidence...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197901000-00004
更新日期:1979-01-01 00:00:00
abstract::Compounds containing mobile protons can act as contrast agents by increasing the value of the term (1/12 - 1/11). The efficiency of this method is markedly pH- and field-dependent. There are many such compounds allowing a choice to be made based on the characteristics of the tissue or organ, magnetic field strength, a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198809001-00058
更新日期:1988-09-01 00:00:00
abstract::Magnetic resonance spectroscopy (MRS) has been most extensively applied to the study of animal models and not humans. The major reason for this extensive animal research is due to the nature of the early magnetic resonance high-field magnets, which only permitted the study of isolated cells, tissues, or small animals....
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:10.1097/00004424-198912000-00004
更新日期:1989-12-01 00:00:00
abstract::Diagnostic radiology is expanding, playing an increasingly central role in patient care, which heightens the importance of radiology teaching in undergraduate medical education. This study examined the impact of increased structure and systematic evaluation on student performance in a radiology elective. The evaluatio...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198505000-00003
更新日期:1985-05-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to investigate the impact of a novel iterative denoising and image enhancement technique in T1-weighted precontrast and postcontrast volume-interpolated breath-hold examination (VIBE) of the abdomen on image quality, noise levels, and diagnostic confidence without change of acquisit...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000746
更新日期:2020-11-18 00:00:00
abstract::The authors correlated sonographic findings with histologic findings in a rabbit model of osteomyelitis. Staphylococcus aureus osteomyelitis was induced in the femora of 11 New Zealand white rabbits. The opposite leg was used as a control. Sonographic findings showed fluid adjacent to the bone in 11 cases. The fluid w...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199202000-00002
更新日期:1992-02-01 00:00:00
abstract::Effectiveness of terbutaline, a potent uterine muscle relaxant, for differentiation of temporary and anatomic interstitial fallopian tube obstruction (IFTO) at hysterosalpingography (HSG) was explored. In 43 IFTO evaluated, HSG after terbutaline showed patency in only one of 16 tubes in which IFTO was caused by spasm ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198803000-00010
更新日期:1988-03-01 00:00:00
abstract::Advances in the field of magnetic resonance (MR) as it pertains to clinical diagnostic radiology are examined in this review on the basis of publications in Investigative Radiology over the past 2 years (2005-2006). The articles published during that timeframe are discussed, organizationally wise, by anatomic region w...
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:10.1097/01.rli.0000250461.03245.5c
更新日期:2006-12-01 00:00:00
abstract:MATERIALS AND METHODS:Stenotic kidney (STK) and contralateral kidney magnetization transfer ratios (MTRs; Mt/M0) were measured at 3.0-T magnetic resonance imaging, at offset frequencies of 600 and 1000 Hz, before and 1 month post-PTRA in 7 RVD pigs. Stenotic kidney MTR was correlated to renal perfusion, renal blood flo...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000711
更新日期:2021-02-01 00:00:00
abstract:OBJECTIVES:Magnetic resonance imaging guidance has been sporadically reported for renal tumor cryoablation (CA); therefore, clinical experience with this modality is still limited.The aim of this study is to retrospectively analyze our 10-year experience with renal tumor CA performed on a 1.5 T magnetic resonance imagi...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000719
更新日期:2020-09-04 00:00:00
abstract:OBJECTIVES:The aim of this study was to conduct a radiopathologic evaluation of right-angled traction bronchiectasis to differentiate idiopathic pulmonary fibrosis (IPF) without honeycombing from idiopathic nonspecific interstitial pneumonia (NSIP). MATERIALS AND METHODS:The derivation cohort included 78 consecutive p...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000651
更新日期:2020-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The purpose of the study was to evaluate the effect of articular fluid distention on patellar position at different degrees of knee angulation. METHODS:Patellar position in 10 cadaveric knee specimens was determined with 30, 100, and 200 mm Hg joint distention at 45, 20, and 5 degrees of knee ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199602000-00001
更新日期:1996-02-01 00:00:00
abstract:RATIONAL AND OBJECTIVES:The feasibility of tubal occlusion by selective salpingography was tested in an animal model; three novel occluding materials also were tested for this application. METHODS:Unilateral selective salpingography was performed in three groups of six rabbits; fallopian tubes were embolized with etha...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199402000-00007
更新日期:1994-02-01 00:00:00
abstract::Frequency spectral analysis of cardiac wall motion as calculated from the recorded video kymogram are demonstrated. Characteristic harmonics following the fundamental frequency of the cardiac rate have been demonstrated to have an alternating sequential energy distribution as measured from the free margin of the left ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197503000-00005
更新日期:1975-03-01 00:00:00
abstract::The morphologic changes in healthy rat kidneys (n = 102) were studied 2 or 48 hours after intravenous injection of 1 or 3 g iodine (I)/kg of high-osmolality diatrizoate, low-osmolality iopromide and iohexol, or iso-osmolality iotrolan, as well as after 0.2 or 0.6 g/kg of the high-osmolality magnetic resonance contrast...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199110000-00009
更新日期:1991-10-01 00:00:00
abstract::Arterial occlusion by direct-current transcatheter electrocoagulation (TCEC) has been developed experimentally and used successfully in clinical situations. The major shortcoming of the technique has been the lengthy time necessary for occlusion of larger arteries. In the present study we attempted to decrease the tim...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198203000-00011
更新日期:1982-03-01 00:00:00
abstract::A feasibility study is described to provide quantitative texture measures to distinguish between normal lung, alveolar infiltrates and interstitial infiltrates. Advanced computer imaging technology and decision making processes were applied to distinguish between these textural patterns. The results, based on computer...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197807000-00005
更新日期:1978-07-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the use of a new thrombus-specific ultrasound contrast agent, MRX-408, in the ultrasonic detection of thrombus in arteriovenous (AV) fistulae. METHODS:Six purpose-bred mongrels with two AV fistulae each were imaged with gray-scale ultrasound 7 weeks after graft implantation before ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200001000-00010
更新日期:2000-01-01 00:00:00
abstract::Four-hour delayed contrast-enhanced computed tomography (DCECT) shows promise for improved detection of focal liver lesions. No previous studies have examined the use of nonionic contrast materials for DCECT. The authors undertook a case-controlled study in monkeys to define the relative efficacies of iopamidol and di...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198910000-00010
更新日期:1989-10-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to compare power versus manual injection in bolus shape and image quality on contrast-enhanced magnetic resonance angiography (CE-MRA). MATERIALS AND METHODS:Three types of CE-MRA (head-neck 3-dimensional [3D] MRA with a test-bolus technique, thoracic-abdominal 3D MRA with a bolus-t...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000383
更新日期:2017-09-01 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::Over the past 120 years, continuous developments in medical imaging has improved diagnosis and treatment for many diseases and has thereby improved treatment outcome and quality of life of many patients. The number of computed tomography (CT) examinations is today increasing by 4% per year worldwide, for a total of ap...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000696
更新日期:2020-09-01 00:00:00
abstract:OBJECTIVES:Ferumoxytol, an intravenous iron supplement, can be used in off-label mode as a contrast agent in magnetic resonance imaging. The aim of this study was to assess whether ferumoxytol can be used as a marker of inflammation in animal models of acute and chronic inflammatory kidney diseases. MATERIAL AND METHO...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000209
更新日期:2016-02-01 00:00:00
abstract::Erythrocytes at various concentrations were examined with a sensitive A-mode ultrasonic scanner; simultaneous measurements were made under light microscopic control. Individual erythrocytes caused weak (about 1 dB) echoes while erythrocyte aggregates (ten to 100 cells) produced stronger echoes (up to 15 dB), grossly p...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198508000-00014
更新日期:1985-08-01 00:00:00
abstract:OBJECTIVE:To demonstrate a method of assessing radiologic diagnostic agreement utilizing multiple blinded external readers. METHODS:Six body CT studies interpreted by one reader (primary reader) at the host institution were compiled with patient identifiers removed. Brief clinical histories that were available to the ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181d2ee97
更新日期:2010-04-01 00:00:00
abstract::Prior to the formation of an intravenous digital subtraction angiography (IV-DSA) image, contrast medium passes through the lesser circulation and is diluted by the blood volume of the heart and lungs. If the contrast medium alone influences central blood volume or cardiac output, the shape of the resultant time-conce...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198603000-00009
更新日期:1986-03-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Time-of-flight magnetic resonance angiography (TOF/MRA) is increasingly used to assess the nature and severity of stenotic blood vessels. Flow artifacts associated with high flows and/or narrow constrictions may confuse the interpretation of these studies. Accurate TOF/MRA evaluations demand an...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199307000-00011
更新日期:1993-07-01 00:00:00
abstract::Sixteen observers averaging 7.4 years experience in interpreting radiology images and 16 observers without radiology training were tested for their ability to detect low-contrast signals in structured noise backgrounds using a digital display system. No significant difference in true positives, false positives, time t...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198704000-00006
更新日期:1987-04-01 00:00:00
abstract::The association of GE Medical Systems and the AUR represents a unique collaboration between academic radiology and industry that bears important potential for elevating the quality of clinical research in radiology and developing a cadre of high-quality radiologist researchers for the future. The establishment of the ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199305000-00001
更新日期:1993-05-01 00:00:00