Abstract:
:Effect of noise reduction filters on chest computed tomographic (CT) images acquired with 50% radiation dose reduction was evaluated. Two sets of images were acquired with multi-detector row CT at standard (220-280 mA) and 50% reduced (110-140 mA) tube current at the level of the carina. After postprocessing with six noise reduction filters, images were compared with baseline standard-dose images for noise, sharpness, and contrast in lungs, mediastinum, and chest wall. Quantitative image noise was measured in descending thoracic aorta. Modulation transfer functions were calculated from CT images of 50-microm wire. Noise reduction filters reduced image noise on low-radiation-dose chest CT images, with some compromise in image sharpness and contrast assessed qualitatively, and slightly altered modulation transfer function at higher spatial frequencies.
journal_name
Radiologyjournal_title
Radiologyauthors
Kalra MK,Wittram C,Maher MM,Sharma A,Avinash GB,Karau K,Toth TL,Halpern E,Saini S,Shepard JAdoi
10.1148/radiol.2281020606subject
Has Abstractpub_date
2003-07-01 00:00:00pages
257-64issue
1eissn
0033-8419issn
1527-1315pii
2281020606journal_volume
228pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract:PURPOSE:To assess forced-expiratory bronchial collapsibility in healthy volunteers by using multidetector computed tomography (CT) and to compare the results with the current diagnostic criterion for bronchomalacia. MATERIALS AND METHODS:The institutional review board approved this HIPAA-compliant study. Following inf...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.10100219
更新日期:2010-11-01 00:00:00
abstract::A model of the normal anatomy of the capsular attachments of the posterior horn of the lateral meniscus is developed based upon anatomic dissections. The term "fascicles" is applied to the delicate bands of connective tissue which join the posterior lateral meniscus to the joint capsule around the popliteal synovial s...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/114.2.335
更新日期:1975-02-01 00:00:00
abstract:PURPOSE:To prospectively assess the potential of noninvasive diffusion-weighted magnetic resonance (MR) imaging to depict changes in microperfusion and diffusion in patients with acute unilateral ureteral obstruction. MATERIALS AND METHODS:The local ethics committee approved the study protocol. Informed consent was ob...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2523082090
更新日期:2009-09-01 00:00:00
abstract::Xeroradiographic evaluation of the axillary lymph nodes permits differentiation of characteristic patterns, including normal nodes and those enlarged as the result of fatty infiltration, inflammation, metastases from a breast primary, or primary nodal disease such as lymphoma or hyperplasia. The author describes his e...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/115.1.67
更新日期:1975-04-01 00:00:00
abstract::Twenty-eight patients with intra-abdominal mesenchymal sarcomas were examined with gray scale ultrasonography. Masses were present in the mesentery, abdominal hollow viscera, liver, and retroperitoneal areas. Four different ultrasonic patterns were observed in the extra hepatic abdominal masses: (a) hyperechoic masses...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/128.1.193
更新日期:1978-07-01 00:00:00
abstract:PURPOSE:To evaluate the usefulness of power Doppler ultrasonography (US) with a microbubble contrast agent in assessing the therapeutic response of hepatocellular carcinomas (HCCs) treated with percutaneous radio-frequency (RF) ablation. MATERIALS AND METHODS:Forty patients with 45 nodular HCC lesions 1.0-3.8 cm in di...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.217.2.r00oc07558
更新日期:2000-11-01 00:00:00
abstract:PURPOSE:To investigate whether default mode network (DMN) spatial properties can be directly affected by pain, with a comparison of painful and nonpainful conditions. MATERIALS AND METHODS:The authors performed a functional magnetic resonance (MR) imaging study, approved by the local institutional ethics committee, in...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2533090602
更新日期:2009-12-01 00:00:00
abstract::Eleven patients who had lung tumors associated with obstructive pneumonitis and who failed to yield diagnostic material at conventional bronchoscopic biopsy underwent real-time ultrasonographic (US) studies and US-guided aspiration biopsy. Sonography of the consolidated lung showed a wedge-shaped hypoechoic lesion con...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.174.3.2406780
更新日期:1990-03-01 00:00:00
abstract::The authors report a case of subacute spinal subdural hematoma in a patient with ankylosing spondylitis. Only 18 such cases have been reported in the nonradiological literature. Early diagnosis is imperative in order to minimize neurological sequelae. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/120.1.116
更新日期:1976-07-01 00:00:00
abstract::Skull scintigraphy was performed in 68 children with suspected craniosynostosis after injection of technetium-99m methylene diphosphonate. The scans demonstrated four patterns of sutural activity: normal, absent, increased, and wide. When correlated with surgical findings, "absent" indicated fused sutures, "increased"...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/133.3.615
更新日期:1979-12-01 00:00:00
abstract::Purpose To assess the performance of computer-aided diagnosis (CAD) systems and to determine the dominant ultrasonographic (US) features when classifying benign versus malignant focal liver lesions (FLLs) by using contrast material-enhanced US cine clips. Materials and Methods One hundred six US data sets in all subje...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2017170365
更新日期:2018-03-01 00:00:00
abstract::Vertebral mineral loss (measured by computed tomography) was compared to peripheral mineral loss (measured by photon absorptiometry) in immobilized monkeys. Significantly greater loss was found in axial cancallous bone than in peripheral cortical bone. The accuracy of vertebral CT measurements in one animal was determ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.134.2.6766220
更新日期:1980-02-01 00:00:00
abstract:PURPOSE:To assess the decisions made by uroradiologists regarding choice of type of intravenous contrast material (low-osmolar contrast media [LOCM] vs conventional ionic agents) and frequency of use of corticosteroid prophylaxis. MATERIALS AND METHODS:A questionnaire was mailed to 158 members of the Society of Urorad...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.194.2.7824710
更新日期:1995-02-01 00:00:00
abstract:PURPOSE:To evaluate the sensitivity and specificity of biphasic computed tomography (CT) with mesenteric CT angiography in the diagnosis of acute mesenteric ischemia (AMI). MATERIALS AND METHODS:Sixty-two patients with clinically suspected AMI underwent prospective imaging with biphasic multi-detector row CT. Mesenter...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2291020991
更新日期:2003-10-01 00:00:00
abstract:PURPOSE:To determine if patients with multiple fluid collections need every collection aspirated and if cross-contamination is a risk if separate sterile procedures are not followed for each aspiration. MATERIALS AND METHODS:Records from 1,076 imaging-guided percutaneous aspirations and drainages over 39 months were r...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.212.3.r99se25669
更新日期:1999-09-01 00:00:00
abstract::The technique of simultaneous acquisition of magnetic resonance images from two different locations was combined with a modification of a commercially available oblique multisection method. By angling the sections slightly from the coronal plane and rotating the subject, simultaneous sections can be obtained within th...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.166.3.3340790
更新日期:1988-03-01 00:00:00
abstract::A survey of the members of the Society for Pediatric Radiology indicates that currently the majority of pediatric radiologists do not perform or interpret examinations using radionuclides, ultrasound, or computed tomography (CT). A decisive factor determining involvement with these techniques is the type of institutio...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.138.1.7455090
更新日期:1981-01-01 00:00:00
abstract:PURPOSE:To determine the prognostic importance of periintervention serum levels of acute-phase reactants in 6-month restenosis after stent implantation in the carotid artery. MATERIALS AND METHODS:One hundred eight consecutive patients with 70% or greater stenosis of the internal carotid artery (ICA) according to the ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2272020183
更新日期:2003-05-01 00:00:00
abstract::Measurements of the intensity distribution of a 60-Co beam revealed a significant field distortion caused by minor misalignment of the collimator assembly which was not detected by routine methods. Accurate monitoring of radiation intensity distribution and periodic visual inspection of collimators are suggested for ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/116.1.226
更新日期:1975-07-01 00:00:00
abstract:PURPOSE:To investigate at which age testicular blood flow can be demonstrated consistently by color Doppler sonography and power Doppler sonography. MATERIALS AND METHODS:In this prospective study, 172 normal testes of 86 boys (age range, 4 days to 15 years) were examined with gray-scale ultrasound, color Doppler sono...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.202.2.9015090
更新日期:1997-02-01 00:00:00
abstract:PURPOSE:To assess the ability of positron emission tomography (PET) with 2-[fluorine-18]fluoro-2-deoxy-D-glucose (FDG) to allow differentiation of benign from malignant intraosseous lesions. MATERIALS AND METHODS:Twenty patients with strictly intraosseous lesions (five benign and 15 malignant [three primary and 12 met...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.200.1.8657920
更新日期:1996-07-01 00:00:00
abstract::Continuous wave (CW) and pulsed Doppler ultrasound studies with spectral analysis were used to detect the left coronary arterial blood flow in patients who were undergoing routine echocardiography. The pulmonary artery is a stable ultrasonic landmark from which detection of the blood flow can be effected. The left cor...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.159.3.3517950
更新日期:1986-06-01 00:00:00
abstract:PURPOSE:To evaluate differences in T2 values in femoral and tibial cartilage at magnetic resonance (MR) imaging in patients with varying degrees of osteoarthritis (OA) compared with healthy subjects and to develop a mapping and display method based on calculation of T2 z scores for visual grading and assessment of cart...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2322030976
更新日期:2004-08-01 00:00:00
abstract::A reciprocating Bucky design for serial film changers is described. It is simple to construct. Inexpensive, and enhances radiograph resolution by eliminating grid lines. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/125.1.250
更新日期:1977-10-01 00:00:00
abstract::Forty-nine patients with deep venous thrombosis (DVT) of the lower limb were studied with repeated duplex ultrasound (US) for at least 1 year or until the vein became normal at US. Standard anticoagulant therapy was given for 3 months. In 36 patients, the veins became normal within 1 year. The likelihood of normalizat...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.179.1.2006290
更新日期:1991-04-01 00:00:00
abstract::A retrospective review of the CT and ultrasound scans from examinations of 30 patients who had hepatocellular carcinoma (hepatoma) was undertaken with special emphasis placed on evaluation of hepatic distribution of tumor, vascular invasion, and extrahepatic spread. Although both CT and ultrasound detected hepatoma in...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.152.2.6330790
更新日期:1984-08-01 00:00:00
abstract::Management of advanced or recurrent primary tracheal neoplasms has been restricted to palliative external beam irradiation. A patient with recurrent adenoid cystic carcinoma of the trachea was recently treated again by combined external irradiation and endotracheal brachytherapy with iridium 192 sources; the results w...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/128.1.209
更新日期:1978-07-01 00:00:00
abstract::The Quantitative Imaging Biomarkers Alliance (QIBA) Profile for fluorodeoxyglucose (FDG) PET/CT imaging was created by QIBA to both characterize and reduce the variability of standardized uptake values (SUVs). The Profile provides two complementary claims on the precision of SUV measurements. First, tumor glycolytic a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2019191882
更新日期:2020-03-01 00:00:00
abstract::Ultrasound detected cystic intracranial lesions in 18 infants. Lesions included porencephaly (6 infants), hydranencephaly (1 infant), a quadrigeminal cyst (1 infant), Dandy-Walker syndrome (1 infant), and cavum septi pellucidi and Vergae (9 infants). Cystic lesions of the infant brain can be delineated accurately with...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.137.2.6968920
更新日期:1980-11-01 00:00:00
abstract:PURPOSE:To study the vascular and biliary liver anatomy and its relevance to the creation of a transjugular intrahepatic portosystemic shunt (TIPS). MATERIALS AND METHODS:Acrylic casts of 25 normal human livers (necropsy specimens) were obtained. The anatomy of the hepatic veins, portal vein, hepatic artery, and bile ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.191.3.8184050
更新日期:1994-06-01 00:00:00