Abstract:
:Quality control in diagnostic radiography begins with production of predictable exposures. The authors describe a technique which permits determination of the variation of mR/mAs for the entire diagnostic range of times and currents in only about 1 hour. The mR/mAs in newly installed units has been shown to vary by as much as +/- 50% compared to institutional acceptance levels of +/- 10%. Records of annual surveys and acceptance tests from 31 medical facilities, including 293 radiographic and fluoroscopic units, are reviewed, and effects of small variations in mAs on radiographic quality are shown.
journal_name
Radiologyjournal_title
Radiologyauthors
Starchman DE,Johnson RG,Howland WJdoi
10.1148/122.2.489subject
Has Abstractpub_date
1977-02-01 00:00:00pages
489-92issue
2eissn
0033-8419issn
1527-1315journal_volume
122pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract::Stitch granuloma is rarely a consideration in the differential diagnosis of stomach lesions. This report documents the occurrence of a granulomatous mass of gastric origin simulating an intramural tumor. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/127.1.84
更新日期:1978-04-01 00:00:00
abstract::The accumulation of technetium-99m diethylenetriamine pentaacetic acid (Tc-99m DTPA) in benign soft-tissue neurofibromatosis tumors is reported. In a series of 16 patients with clinical stigmata of neurofibromatosis, 28 sites of abnormal soft-tissue localization of the isotope observed scintigraphically were documente...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.157.3.3933050
更新日期:1985-12-01 00:00:00
abstract:PURPOSE:To evaluate the effect of scanner type and calcium measure on the reproducibility of calcium measurements. MATERIALS AND METHODS:This investigation was approved by the institutional review boards of each study site and by the Institutional Review Board of the Los Angeles Biomedical Research Institute. Informed...
journal_title:Radiology
pub_type: 杂志文章,评审
doi:10.1148/radiol.2362040513
更新日期:2005-08-01 00:00:00
abstract::Few reports have described the nature of the appearance of nonacute subdural hematoma on magnetic resonance (MR) images. The authors analyzed MR images in 39 cases of nonacute subdural hematoma and subdural effusion by measuring in vitro proton relaxation times and the biochemical variables of hematoma fluids. T1 beca...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.171.2.2704810
更新日期:1989-05-01 00:00:00
abstract::To determine the clinical and mammographic features of recurrent breast cancer after tumorectomy and radiation therapy, the authors reviewed the clinical history and serial mammograms of 48 patients with suspected recurrence. Of patients with recurrent disease, seven had positive mammograms alone, nine had positive fi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.176.3.2167500
更新日期:1990-09-01 00:00:00
abstract::Digital radiographs obtained with a CT scanner were evaluated as an alternative to conventional pelvimetry. Dosimetry studies demonstrated an absorbed radiation dose of 22 mrad for each digital radiograph, approximately 3% of the dose for comparable standard radiographs. Distance measurements were accurately made on d...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.143.3.7079500
更新日期:1982-06-01 00:00:00
abstract:PURPOSE:To quantitatively evaluate and validate a two-phase helical computed tomographic (CT) protocol for evaluation of pancreatic tumors. MATERIALS AND METHODS:Twenty-seven patients with pathologically proved pancreatic adenocarcinomas prospectively underwent two-phase CT examination with helical acquisition during ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.199.3.8637990
更新日期:1996-06-01 00:00:00
abstract::Purpose To determine whether gadolinium deposits in neural tissues of patients with intracranial abnormalities following intravenous gadolinium-based contrast agent (GBCA) exposure might be related to blood-brain barrier integrity by studying adult patients with normal brain pathologic characteristics. Materials and M...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2017161595
更新日期:2017-11-01 00:00:00
abstract:PURPOSE:To compare the local-regional staging accuracy of the conventional two-dimensional (2D) T2-weighted imaging protocol and of the three-dimensional (3D) T2-weighted imaging protocol for preoperative magnetic resonance (MR) imaging in rectal cancer patients. MATERIALS AND METHODS:This retrospective study was appr...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.09090587
更新日期:2010-02-01 00:00:00
abstract::The radiopharmaceutical iodine 131 metaiodobenzylguanidine (I-131 MIBG) has been shown to locate pheochromocytomas scintigraphically with a false-negative rate of approximately 13%. To improve image quality and reduce the false-negative rate, I-123 was examined as a radioactive label for MIBG, as it has many advantage...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.155.3.4001380
更新日期:1985-06-01 00:00:00
abstract::Cerebral amyloid angiopathy (CAA) is a cause of intracerebral hemorrhage in a significant proportion of normotensive patients. Two cases of pathologically proved multiple intracerebral hemorrhages due to CAA are reported. These hemorrhages are accurately demonstrated on computed tomography and are typically superficia...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.151.2.6709910
更新日期:1984-05-01 00:00:00
abstract::Radiographs of 38 children with Down syndrome (aged 2-3 years) were retrospectively evaluated for hypoplasia of the posterior arch of the C-1 vertebra. The anteroposterior dimensions of the posterior arch of C-1 were measured and compared with those of an age- and sex-matched control group. The posterior arches of C-2...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.183.1.1532260
更新日期:1992-04-01 00:00:00
abstract::Clinical, angiographic, scintigraphic and pathologic observations in myocardial contusion were correlated. Radionuclide imaging of the injured heart with 99mTc-Sn-polyphosphate provides an accurate diagnosis in acute, even mild, myocardial contusion. The study can be carried out without danger to the critically ill pa...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/116.3.679
更新日期:1975-09-01 00:00:00
abstract::Purpose To investigate whether whole-liver enhancing tumor burden [ETB] can serve as an imaging biomarker and help predict survival better than World Health Organization (WHO), Response Evaluation Criteria in Solid Tumors (RECIST), modified RECIST (mRECIST), and European Association for the Study of the Liver (EASL) m...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2016160838
更新日期:2017-06-01 00:00:00
abstract:PURPOSE:To determine whether apparent diffusion coefficient (ADC) values vary according to tumor-stroma ratio, dominant stroma type, or presence of central fibrosis in estrogen receptor-positive breast cancer. MATERIALS AND METHODS:Institutional review board approval was obtained, and patient consent was waived. Sixty...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.13131073
更新日期:2014-04-01 00:00:00
abstract::Over 1/3 of patients with renal cell carcinoma will present with metastases with no symptoms referable to the kidney. Early metastatic disease is a result of the unique accessibility of the kidney to lymphohematogenous pathways. The thorax is particularly vulnerable. Several of the more unusual manifestations involvin...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/121.1.43
更新日期:1976-10-01 00:00:00
abstract::The chest radiographs and computed tomographic (CT) scans obtained in eight patients with pathologically proved cases of thoracic actinomycosis were independently reviewed by two observers. All patients were alcoholic men aged 42-62 years. Air-space consolidation, seen on the radiograph and CT scan in each case, was p...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.183.1.1549670
更新日期:1992-04-01 00:00:00
abstract::The effects of increasing single selective doses of prostaglandin E1 (PGE1) on superior mesenteric arterial flow and portal and systemic blood pressures were studied in dogs to assess its value as a vasodilatory agent for pharmacoangiography. PGE1 consistently increased blood flow, with an average increase of 187%, bu...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/116.1.207
更新日期:1975-07-01 00:00:00
abstract:PURPOSE:To retrospectively evaluate the long-term results of radiofrequency (RF) ablation combined with chemoembolization (combination therapy) as compared with hepatectomy for the treatment of early-stage hepatocellular carcinoma (HCC). MATERIALS AND METHODS:The study was approved by the institutional review board, a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2471070818
更新日期:2008-04-01 00:00:00
abstract:PURPOSE:To compare the performance of magnetic resonance (MR) imaging after the administration of superparamagnetic iron oxide (SPIO) and dual-phase computed tomography (CT) in the depiction of liver metastases. MATERIALS AND METHODS:Fifty-one hepatic resection candidates with known colorectal metastases were examined...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.210.2.r99fe05459
更新日期:1999-02-01 00:00:00
abstract:PURPOSE:To determine the radiologic appearance of ganglioneuromas of the adrenal gland and extra-adrenal retroperitoneum. MATERIALS AND METHODS:A retrospective review was performed of imaging findings in nine patients with ganglioneuroma, two with ganglioneuroma-pheochromocytoma, and two with malignant peripheral nerv...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.202.3.9051020
更新日期:1997-03-01 00:00:00
abstract::The pressures generated by a barium suspension and various solutions of meglumine sodium diatrizoate in water were measured with a manometer. A pressure of 120 mm Hg was produced by a 3.5-foot (105-cm) column of 60% wt/vol barium and a 5-foot (150-cm) column of either a 1:3 or 1:4 solution of meglumine sodium diatrizo...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.175.1.2315470
更新日期:1990-04-01 00:00:00
abstract::Purpose To assess whether contrast material-enhanced ultrasonography (US) can be used to differentiate responders from nonresponders among patients with clinically active Crohn disease after 6 weeks of pharmacologic treatment. Materials and Methods This prospective study was approved by our ethics committee, and writt...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2016152461
更新日期:2016-11-01 00:00:00
abstract::Percutaneous biopsies of mediastinal tumors were successfully performed under sonographic guidance in 14 of 21 patients. In 10 of 11 malignant lesions, malignancy was determined by means of cytologic and histologic examination of the specimens obtained. A histologic diagnosis was reached in seven patients with maligna...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.172.2.2664870
更新日期:1989-08-01 00:00:00
abstract::Spiral volumetric computed tomography (CT) with single breath-hold technique was compared with conventional sequential CT in 39 patients. The spiral CT protocol consisted of a 10 mm/sec table feed during a 24-second breath hold at 145 mA, with reconstruction of images at 10-mm intervals; one (n = 21) or two (n = 18) s...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.187.2.8475300
更新日期:1993-05-01 00:00:00
abstract::Fifty cadaver ankles were examined with ankle tenography. The normal tenographic appearance of the peroneus longus and brevis, posterior tibial, flexor digitorum longus, flexor hallucis longus, anterior tibialis, extensor hallucis longus, and extensor digitorum longus tendons and sheaths are described and illustrated ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.151.3.6718710
更新日期:1984-06-01 00:00:00
abstract::Retrospective analysis of 139 ventilation-perfusion (V/Q) lung scans obtained for suspected pulmonary embolism (PE) was undertaken, using the Biello criteria for interpretation. All scans were correlated with chest radiographs obtained within 24 hours and with pulmonary angiograms obtained within 72 hours of the V/Q s...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.159.2.3961170
更新日期:1986-05-01 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::Sixteen patients with biliary atresia and 11 patients with neonatal hepatitis were studied preoperatively with either Tc-99m-diethyl-IDA or TC-99m-diisopropyl-IDA. Two parameters were evaluated: hepatocyte clearance and time to appearance of radioactivity in the intestine. Two observers, using a visual grading system ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.146.2.6681570
更新日期:1983-02-01 00:00:00
abstract:PURPOSE:To evaluate the accuracy of ultrasonographic (US) features of adenomyosis by correlating them with histologic findings and to assess inter- and intraobserver agreement. MATERIALS AND METHODS:US was performed and videotaped in 102 consecutive hysterectomy specimens in a water bath. Videotapes were reviewed init...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.215.3.r00jn06783
更新日期:2000-06-01 00:00:00