Abstract：
RATIONALE AND OBJECTIVES:Acoustic noise both in terms of its magnitude and frequency during magnetic resonance imaging (MRI) scan is influenced by imaging parameters and pulse sequences. It varies because of many different factors such as structure, materials, and magnetic field strength. The purpose of our study is to evaluate the characteristics of acoustic noise independent of MRI scan protocol by measuring a gradient-pulse-to-acoustic-noise transfer function (GPAN-TF) at various MRI scanners. MATERIALS AND METHODS:We measured sound pressure levels in the frequency domain in a 0.4-T, seven 1.5-T, and three 3.0-T clinical MRI systems when applying a simple narrower trapezoidal gradient pulse. We calculated a GPAN-TF [μPa/(mT/m)] in each gradient coil (ie, X, Y, and Z-axis) by the deconvolution process. RESULTS:GPAN-TF at a high-frequency range (1000-10,000 Hz) was larger than that at low frequency for all MRI (P<0.01) scanners except for a low static field machine. For high frequency (>1000 Hz), the 3.0-T MRI scanner had a larger GPAN-TF than that of 0.4-T and 1.5-T (P < .01). MR scanner with a vacuum chamber reduced GPAN-TF at a lower frequency (P < .01), but this effect decreased at higher frequency. CONCLUSION:GPAN-TF analysis makes it possible to obtain more detailed information on acoustic noise properties among MRI scanners.
journal_name
Acad Radioljournal_title
Academic radiologyauthors
Hamaguchi T,Miyati T,Ohno N,Hirano M,Hayashi N,Gabata T,Matsui O,Matsushita T,Yamamoto T,Fujiwara Y,Kimura H,Takeda H,Takehara Ydoi
10.1016/j.acra.2010.09.009subject
Has Abstractpub_date
2011-01-01 00:00:00pages
101-6issue
1eissn
1076-6332issn
1878-4046pii
S1076-6332(10)00518-0journal_volume
18pub_type
杂志文章,多中心研究abstract：RATIONALE AND OBJECTIVES:The purpose of this study was to investigate the importance of view box luminance and viewing conditions on low-contrast detection by readers. MATERIALS AND METHODS:Radiographs of a mammographic contrast-detail phantom were examined on 632 view box panels. The luminance of these panels was obt...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/S1076-6332(99)80429-2
更新日期：1999-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To document the frequency of normal and anomalous drainage patterns of the pulmonary veins, and to establish normal values for pulmonary vein ostial diameters, and distance to first bifurcation using multidetector computed tomography, as pertinent to ablation procedures for atrial fibrillation....
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2006.11.004
更新日期：2007-02-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The American Association of Academic Chief Residents in Radiology annually surveys residency programs on a variety of issues related to residency training. The survey results allow individual programs to compare features of their programs with national averages and to gauge trends in radiology ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(98)80288-2
更新日期：1998-03-01 00:00:00
abstract：:The role of positron emission tomography (PET) during the past decade has evolved rapidly from that of a pure research tool to a methodology of enormous clinical potential. (18)F-fluorodeoxyglucose (FDG)-PET is currently the most widely used probe in the diagnosis, staging, assessment of tumor response to treatment, a...
journal_title：Academic radiology
pub_type： 杂志文章,评审
doi：10.1016/j.acra.2009.02.014
更新日期：2009-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Some deep pelvic abscesses are not accessible through anterior or lateral approaches because of the presence of organs and structures. The objective of this study was to assess the feasibility, safety, tolerability, and efficacy of a percutaneous presacral space approach by reviewing our clinic...
journal_title：Academic radiology
pub_type： 杂志文章,评审
doi：10.1016/j.acra.2016.06.009
更新日期：2016-12-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:We sought to quantify patient preferences for mild, moderate, and severe low back pain via time-tradeoff analysis and utility measurement. MATERIALS AND METHODS:Forty-one patients being treated for low back pain in a tertiary care teaching hospital participated in the study. Patients were aske...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.11.031
更新日期：2005-04-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:An automated method for identification and segmentation of acute/subacute ischemic stroke, using the inherent bi-fold symmetry in brain images, is presented. An accurate and automated method for localization of acute ischemic stroke could provide physicians with a mechanism for early detection ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2008.03.013
更新日期：2008-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:In clinical guideline or criteria development processes, such as those used in developing American College of Radiology Appropriateness Criteria (ACR AC), experts subjectively evaluate benefits and risks associated with imaging tests and make complex decisions about imaging recommendations. The...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2017.01.001
更新日期：2017-05-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Emerging alternative metrics leverage social media and other online platforms to provide immediate measures of biomedical articles' reach among diverse public audiences. We aimed to compare traditional citation and alternative impact metrics for articles in popular general radiology journals. ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2016.11.019
更新日期：2017-07-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To evaluate the potential use of gadolinium (Gd)-based contrast media, especially that of Gadovist, a 1-molar Gd medium, in computed tomography (CT) and compare our findings with standard iodinated contrast media. MATERIAL AND METHODS:Using a live rabbit and an acrylic CT body phantom for comp...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2006.03.019
更新日期：2006-08-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Estimation of regional lung function parameters from hyperpolarized gas magnetic resonance images can be very sensitive to presence of noise. Clustering pixels and averaging over the resulting groups is an effective method for reducing the effects of noise in these images, commonly performed by...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2008.03.002
更新日期：2008-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:We compared the performance of fast spin-echo (FSE) with conventional spin-echo (CSE) magnetic resonance (MR) imaging sequences in the detection of meniscal tears. METHODS:Seventy-three patients underwent MR examination of the knee for suspected internal derangement. Each patient was scanned w...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(05)80166-7
更新日期：1995-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:This study compares the performance of T2 maps in the detection of prostate cancer (PCa) in comparison to T2-weighted (T2W) magnetic resonance images. MATERIALS AND METHODS:The prospective study was institutional review board approved. Consenting patients (n = 45) with histologic confirmed PCa...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2018.04.005
更新日期：2019-01-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Physiological measurements from coronary angiography show that coronary stenosis with necrotic core plaque reduces coronary flow reserve (CFR). Myocardial flow reserve (MFR) estimated by 13N-ammonia PET (NH3-PET) is a different index from CFR. Low attenuation plaque (LAP) on coronary CTA (CCTA)...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2020.11.012
更新日期：2020-12-03 00:00:00
abstract：RATIONALE AND OBJECTIVES:The purpose of this prospective randomized study was to compare the long-term instructional effectiveness of a computer-based radiology multimedia textbook (MMTB) with that of a traditional lecture. METHODS:Volunteer faculty/fellows and residents were randomly assigned to either a computer-bas...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(05)80731-7
更新日期：1994-11-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To investigate the capability of delta-radiomics to predict pathological complete response (pCR) after neoadjuvant chemoradiotherapy (nCRT) in patients with locally advanced rectal cancer (LARC). MATERIALS AND METHODS:This retrospective study enrolled 165 consecutive patients with LARC (traini...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2020.10.026
更新日期：2020-11-11 00:00:00
abstract：RATIONALE AND OBJECTIVES:The association between hepatic steatosis and oral 5-fluorouracil (5-FU) agents is clinically recognized but has not been systematically studied. The aim of this study was to determine the effects of 5-FU on hepatic fat content in patients undergoing oral 5-FU therapy and to compare the effects...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2005.02.010
更新日期：2005-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The purpose of this study was to evaluate residents' use of a radiology curriculum CD-ROM designed to provide ready access to the department's curricula, study materials, and Internet resources. MATERIALS AND METHODS:A survey questionnaire eliciting feedback about the usability and value of th...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(03)80085-5
更新日期：2003-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of this study was to assess if graphical user interface screen-capture software applied to a magnetic resonance (MR) hardware console could nonintrusively allow the analysis of discrepancies between expected and experienced MR table time. MATERIALS AND METHODS:Individual MR examination...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2009.05.009
更新日期：2009-10-01 00:00:00
abstract：RATIONALE AND OBJECTIVE:Targeted delivery is a highly desirable strategy for diagnostic imaging because of enhanced efficacy and reduced dosage/toxicity. Receptor-targeting was used to deliver contrast-producing superparamagnetic iron oxide (IO) nanoparticle to receptor-expressing tumors for in vivo magnetic resonance ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.04.018
更新日期：2004-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The authors performed this study to determine whether intrathoracic inoculation of non-small-cell lung carcinoma with fluoroscopic guidance would provide for more accurate implantation. MATERIALS AND METHODS:A tumor cell inoculum (2 x 10(6) cells per 0.15 mL) was injected percutaneously under ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(05)80267-3
更新日期：1997-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Describe new interactive digital teaching methods for medical student education in radiology and evaluate student responses. MATERIALS AND METHODS:Third- and fourth-year medical students on radiology clerkship were taught using either film-based "hot seat" format, digital "hot seat," or didact...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.07.017
更新日期：2004-11-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:68Ga-prostate-specific membrane antigen-11 (68Ga-PSMA-11) is a recently developed positron emission tomography (PET) tracer that can detect prostate cancer (PC) relapses and metastases with high contrast resolution. The aim of this study was to assess the detection efficacy and diagnostic accur...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2018.05.020
更新日期：2019-04-01 00:00:00
abstract：:In this article, we describe how social media can supplement traditional education, articulate the advantages and disadvantages of various social media platforms for both teachers and learners, discuss best practices to maintain confidentiality of protected health information, and provide tips for implementing social ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2016.12.023
更新日期：2017-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To quantify the relationship between dose of contrast administered and contrast kinetics of malignant breast lesions. MATERIALS AND METHODS:A total of 108 patients with 120 malignant lesions were selected for an institutional review board-approved review. Dynamic magnetic resonance protocol: o...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2009.06.015
更新日期：2010-01-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Contrast agents have been shown to produce vasodilatory responses in several vascular beds. To our knowledge, however, their effect on the bronchial vasculature has not been examined. Clinically, contrast-induced bronchial vasodilation could potentially exacerbate life-threatening pulmonary hem...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(05)80700-7
更新日期：1995-11-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To establish the range of normal for quantitative computed tomography (CT)-based measures of lung structure and function, we seek to develop methods for matching pulmonary structures across individuals and establishing a normative human lung atlas. MATERIALS AND METHODS:In our previous work, w...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2012.04.025
更新日期：2012-11-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Subcutaneous melanomas may be missed on computed tomography because of their peripheral location or perceived unimportance, yet they can have clinical significance. The use of a novel computer-assisted detection scheme to locate subcutaneous melanoma lesions in body CT images was investigated. ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.01.005
更新日期：2004-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Inguinal lymph nodes can be the first or the only clinical signs of tumor metastases. The aim of the study was to evaluate the role of contrast-enhanced high-resolution magnetic resonance (MR) lymphangiography in diagnosis of inguinal lymph node metastases. MATERIALS AND METHODS:The study enro...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2012.09.014
更新日期：2013-02-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Evidence is inconsistent about whether radiologists' interpretive performance on a screening mammography test set reflects their performance in clinical practice. This study aimed to estimate the correlation between test set and clinical performance and determine if the correlation is influence...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2017.03.016
更新日期：2017-10-01 00:00:00
