Abstract:
:Irradiation of the orbit is often associated with substantial dose inhomogeneity resulting from the insertion of lens blocks. We postulated that such dose inhomogeneity, which often exceeds 40%, could be halved by the use of two pairs of wedged beams, one angled in the sagittal plane and the other in the commonly employed transverse plane. The sagittal plane is obtained by turning the treatment couch 90 degrees. All beams carried a central-axis lens block and were angled 30 degrees relative to the vertical. Verification of dose distribution was obtained by film dosimetry in a head phantom for central- and off-axis planes. These measurements indicate that significant improvement in dose homogeneity over alternate methods can be achieved with this technique.
journal_name
Radiologyjournal_title
Radiologyauthors
Harisiadis L,Schell MC,Working KR,Justice T,Wessels BW,Ling CCdoi
10.1148/radiology.156.3.4023250subject
Has Abstractpub_date
1985-09-01 00:00:00pages
823-4issue
3eissn
0033-8419issn
1527-1315journal_volume
156pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract::Gas within embolized, uninfected tumors has been ascribed to either carbon dioxide produced through anaerobic reticulocyte metabolism or oxygen release from oxyhemoglobin. An alternative hypothesis explaining the presence of gas within embolized, uninfected tumors, namely, that gas is introduced during the embolizatio...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.147.2.6300960
更新日期:1983-05-01 00:00:00
abstract::The authors describe a modified Seldinger Technique for sialography which is especially helpful in cannulization of the submandibular ducts. This procedure was successful in 2. of 30 patients tested. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/123.1.232
更新日期:1977-04-01 00:00:00
abstract:PURPOSE:To assess the value of clinical, chest radiographic, and computed tomographic (CT) findings in classifying chronic diffuse infiltrative lung disease (CDILD) MATERIALS AND METHODS: Two samples from the same population were consecutively studied: the training set (group A, n = 208) for the development of the deci...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.191.2.8153310
更新日期:1994-05-01 00:00:00
abstract:PURPOSE:To investigate neuronal activations during processing of radiologic and nonradiologic images by experienced radiologists and nonradiologist subjects by using event-related functional magnetic resonance (MR) imaging. MATERIALS AND METHODS:Study was approved by local ethics committee, and informed consent was ob...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2363041370
更新日期:2005-09-01 00:00:00
abstract::Purpose To report the results of dual-time-point gallium 68 (68Ga) prostate-specific membrane antigen (PSMA)-11 positron emission tomography (PET)/magnetic resonance (MR) imaging prior to prostatectomy in patients with intermediate- or high-risk cancer. Materials and Methods Thirty-three men who underwent conventional...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2018172232
更新日期:2018-08-01 00:00:00
abstract:PURPOSE:To evaluate the feasibility of reconstructing single and multiple targets by using fluorescence-enhanced tomography of a breast tissue phantom. MATERIALS AND METHODS:Frequency-domain fluorescence measurements were performed in cup-shaped tissue phantoms of clinically relevant size (diameter, 10 cm) in which si...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2343031725
更新日期:2005-04-01 00:00:00
abstract::The small digital computer is becoming ever more powerful, reliable, and inexpensive. Diagnostic radiology and the computer are becoming more intertwined. During the past decade, computed tomography (CT) has achieved outstanding success. CT and other digital image systems that are capable of computer manipulation, sto...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.145.2.7134470
更新日期:1982-11-01 00:00:00
abstract:PURPOSE:To assess the feasiblity of magnetic resonance (MR) susceptibility-weighted (SW) imaging as a tool to evaluate liver fibrosis grades in patients with chronic liver diseases (CLD) utilizing signal intensity (SI) measurements, with histopathologic findings as the reference standard. MATERIALS AND METHODS:This re...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.13122440
更新日期:2014-01-01 00:00:00
abstract::The effects of magnetic resonance (MR) pulse sequences and timing parameters on tumor-liver contrast were studied in an animal model of metastatic liver cancer. Six spin-echo (SE), three inversion-recovery (IR), and four gradient-echo (GRE) sequences were evaluated at 0.6 T before and after injection of super-paramagn...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.172.2.2748820
更新日期:1989-08-01 00:00:00
abstract::Seventy "low-suspicion," nonpalpable solid breast nodules were evaluated with stereotaxic fine-needle aspiration with cytologic analysis as an alternative to follow-up mammography. Sonography was performed in all cases to determine the solid nature of the nodules. Eight cysts were incorrectly classified with sonograph...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.183.3.1584910
更新日期:1992-06-01 00:00:00
abstract:PURPOSE:To determine diagnostic accuracy of four-channel multi-detector row computed tomography (CT) in emergency room and inpatient populations suspected of having acute pulmonary embolism (PE) who prospectively underwent both CT and pulmonary arteriography (PA). MATERIALS AND METHODS:Patients referred for PA to asse...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2333031744
更新日期:2004-12-01 00:00:00
abstract:PURPOSE:To assess the benefit of adding diffusion-weighted (DW) imaging to gadoxetic acid-enhanced magnetic resonance (MR) imaging and MR cholangiopancreatography in the preoperative evaluation of hilar cholangiocarcinoma. MATERIALS AND METHODS:The institutional review board approved this retrospective study and waive...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.13130009
更新日期:2014-03-01 00:00:00
abstract:PURPOSE:To compare diffusion tensor magnetic resonance imaging with conventional T2-weighted imaging for evaluation of white matter changes in patients with Krabbe disease. MATERIALS AND METHODS:In eight patients with Krabbe disease and eight age-matched control subjects, anisotropy maps were generated with diffusion ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.218.3.r01mr14809
更新日期:2001-03-01 00:00:00
abstract:PURPOSE:To prospectively determine the magnetic resonance (MR) signal intensity characteristics of structures of the ampullary region and to assess the potential use of MR imaging in evaluation of the extent of periampullary tumors in resected specimens. MATERIALS AND METHODS:Twenty-five specimens from the ampullary r...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2313030797
更新日期:2004-06-01 00:00:00
abstract::Previous reports of angiomyolipoma have emphasized the ultrasonic finding of a very echogenic intrarenal mass. Ten cases of angiomyolipoma for which ultrasound examinations were available were retrospectively reviewed and correlated with their pathologic findings, and, when available, with computed tomographic finding...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.139.2.7220890
更新日期:1981-05-01 00:00:00
abstract::To ascertain the sensitivity of physical examination with respect to significant arterial injury, the angiographic findings of 61 stab wounds to the extremities were correlated with specific physical findings. In 25 injuries there were physical findings of major injury, including one or more of the following: pulse de...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.162.2.3797660
更新日期:1987-02-01 00:00:00
abstract:PURPOSE:To assess the safety and effectiveness of percutaneous radiofrequency (RF) ablation of subcapsular liver tumors. MATERIALS AND METHODS:The study protocol was approved by the institutional review board, and all patients gave written informed consent. One hundred eighty-one patients (79 men, 102 women; age range...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2482071690
更新日期:2008-08-01 00:00:00
abstract:PURPOSE:To retrospectively evaluate the prevalence of focal fluorodeoxyglucose (FDG) uptake by the thyroid gland on combined positron emission tomographic (PET) and computed tomographic (CT) scans in patients undergoing staging of newly diagnosed non-small cell lung cancer (NSCLC). MATERIALS AND METHODS:Institutional ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2361041007
更新日期:2005-07-01 00:00:00
abstract::History A 3-month-old previously healthy girl presented to an outside institution with a 4-day history of low-grade fever, irritability, and a tender "knot" in the upper abdomen. Ultrasonography (US) was performed at an outside hospital. US images were not available for review; however, they showed a mass in the left ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2018160106
更新日期:2018-05-01 00:00:00
abstract:PURPOSE:To evaluate the long-term effectiveness of percutaneous treatment of liver hydatid cysts. MATERIALS AND METHODS:Thirty-one patients (19 female patients and 12 male patients; age range, 8-78 years; mean age, 41 years) with 57 liver hydatid cysts underwent percutaneous treatment. The cysts were treated with hype...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.198.1.8539390
更新日期:1996-01-01 00:00:00
abstract::Twenty consecutive patients with known liver malignancies underwent ultrasonography (US) in conventional B mode and in pulse-inversion mode in the late hepatic-specific parenchymal phase after intravenous administration of SH U 508A, a microbubble US contrast agent. Two experienced readers assessed subjective and obje...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.216.3.r00se22903
更新日期:2000-09-01 00:00:00
abstract::MRI is firmly established as an essential modality in the imaging of the temporal bone and lateral skull base. It is used to evaluate normal anatomic structures, evaluate for vestibular schwannomas, assess for inflammatory and/or infectious processes, and detect residual and/or recurrent cholesteatoma. It is also exte...
journal_title:Radiology
pub_type: 杂志文章,评审
doi:10.1148/radiol.2020201767
更新日期:2020-11-01 00:00:00
abstract:PURPOSE:To determine if the addition of three-dimensional (3D) proton magnetic resonance (MR) spectroscopic imaging to endorectal MR imaging helps diagnose extracapsular extension (ECE) of prostate cancer. MATERIALS AND METHODS:Endorectal MR imaging and 3D MR spectroscopic imaging were performed in 53 patients with pr...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.213.2.r99nv26481
更新日期:1999-11-01 00:00:00
abstract::The purpose of this study was to demonstrate the feasibility of computing three-dimensional relaxation maps of spin-lattice relaxation time in the rotating frame (T1rho) from in vivo magnetic resonance (MR) images of the human patellofemoral joint. T1rho was measured by applying a three-dimensional gradient-echo pulse...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2291021041
更新日期:2003-10-01 00:00:00
abstract::Bowel perforation by ventriculo-peritoneal shunts occurred in two children with no abdominal symptoms. The diagnosis in each instance was confirmed by opacification of the colon in one child and the small bowel in the other via contrast medium injection of the distal shunt tubing. "Shuntograms" are recommended for all...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/121.3.701
更新日期:1976-12-01 00:00:00
abstract::Purpose To investigate the prognostic value of circumferential left ventricular (LV) strain measured by using cardiac MRI for prediction of major adverse cardiac events (MACE) following an acute ST-segment-elevation myocardial infarction (STEMI). Materials and Methods Participants with acute STEMI were prospectively e...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2018181253
更新日期:2019-02-01 00:00:00
abstract::Treatment of cancer is often confounded by tumor heterogeneity.Variations in perfusion inhibit drug delivery to all parts of the tumor (1). Differences in oxygen tension (Po2)cause variations in response to radiation therapy (2).Understanding this tumor heterogeneity, which is caused by the interplay between the cance...
journal_title:Radiology
pub_type: 评论,杂志文章
doi:10.1148/radiol.12120252
更新日期:2012-05-01 00:00:00
abstract:PURPOSE:To evaluate breast imaging training and knowledge of radiology residents over a 3-year period. MATERIALS AND METHODS:From 1992 through 1994, the American College of Radiology (ACR) sponsored a 1-day comprehensive breast imaging seminar, which was attended by 2,249 radiology residents at the 6-week radiologic-p...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.201.3.8939230
更新日期:1996-12-01 00:00:00
abstract:PURPOSE:To determine the accuracy of T1-weighted fat-suppressed (FS) three-dimensional (3D) fast low-angle shot (FLASH) magnetic resonance (MR) imaging for the detection of articular cartilage abnormalities of the patellofemoral joint. MATERIALS AND METHODS:Forty-one patients with suspected internal derangement of the...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.198.1.8539380
更新日期:1996-01-01 00:00:00
abstract:PURPOSE:To evaluate whether exposure to strong static magnetic fields (SMFs), of up to 10 T, affects the growth and cycle distribution of and the micronucleus formation in monolayered Chinese hamster ovary CHO-K1 cells. MATERIALS AND METHODS:The authors developed a system to expose cultured cells to strong SMFs immedi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2243011300
更新日期:2002-09-01 00:00:00