The Experts below are selected from a list of 36696 Experts worldwide ranked by ideXlab platform
William A. Murphy - One of the best experts on this subject based on the ideXlab platform.
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central venous line placement in the superior vena cava and the azygos vein differentiation on posteroanterior chest Radiographs
American Journal of Roentgenology, 2011Co-Authors: Tamara Miner Haygood, Patrick C Brennan, John Ryan, Josemiguel Yamal, Lindsay Liles, Paul Osullivan, Colleen M Costelloe, Nancy E Fitzgerald, William A. MurphyAbstract:OBJECTIVE. The purpose of this study was to determine, first, the accuracy with which radiologists reading posteroanterior chest Radiographs differentiate whether a central venous line is in the superior vena cava or the azygos vein and, second, the circumstances in which radiologists may omit the lateral view to determine the position of a central venous line.MATERIALS AND METHODS. Twenty-four radiologists evaluated 60 posteroanterior chest Radiographs to determine the position of a central venous line in the superior vena cava or azygos vein. Investigators evaluated the appearance of the central venous lines to refine rules for determining central venous line position on a frontal Radiograph and omitting the lateral view.RESULTS. The accuracy of posteroanterior Radiography for determining central venous line position was 90% at one study location and 85.5% at the other. No central venous line in the azygos vein extended more than 10.9 mm caudal to the cephalic edge of the right main bronchus. No central...
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Evaluation of the injured cervical spine: comparison of conventional and storage phosphor Radiography with a hybrid cassette.
Radiology, 1994Co-Authors: Anthony J. Wilson, F. A. Mann, O. Clark West, Kevin W. Mcenery, William A. MurphyAbstract:PURPOSE: To compare conventional and storage phosphor Radiography of the injured cervical spine. MATERIALS AND METHODS: Sixty-five patients underwent imaging in a supine position while wearing a cervical collar. Matched storage phosphor and conventional lateral cervical spine Radiographs were obtained with an 18 x 24-cm hybrid cassette. Edge-enhanced and nonenhanced copies of each computed Radiograph were printed on film, and the images were sent via a computer network to a remote imaging workstation. Four radiologists read the conventional Radiographs, the two hard-copy computed Radiographs, and the soft-copy images and used a binary scale to score the visibility of bone and soft-tissue structures. RESULTS: All readers scored better in all areas with computed Radiographs, and a statistically significant (P = .030) improvement in performance was seen for soft-tissue structures. CONCLUSION: Storage phosphor imaging offers advantages over conventional Radiography, and digital images may be a viable alternat...
Yoshinori Kadoya - One of the best experts on this subject based on the ideXlab platform.
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axial Radiography of the distal femur to assess rotational alignment in total knee arthroplasty
Clinical Orthopaedics and Related Research, 2005Co-Authors: Kouichi Kanekasu, Makoto Kondo, Yoshinori KadoyaAbstract:A method for taking an axial Radiograph of the distal femur was developed to see the epicondyles and posterior condyles of the femur. It was hypothesized that these Radiographs would be acceptable for evaluating rotational alignment in total knee arthroplasty with comparable reproducibility and good correlation to the results obtained with computed tomography images. Radiographs were obtained of 50 knees in 32 patients having total knee arthroplasty. The Radiographs were taken while the patients were with the knee in 90 degrees flexion. The angle between the clinical epicondylar axis and the posterior condylar axis (twist angle) was measured and compared with the results obtained by conventional computed tomography. The interobserver variation in the axial Radiography was less than or comparable to the computed tomography method. The mean discrepancy between the two methods (+/- standard deviation) was 0.5 degrees +/- 0.4 degrees (range, 0-1.9 degrees ), and a strong correlation was observed. This plain Radiography is acceptable for evaluation of femoral component rotation with comparable reproducibility and correlation to the results with computed tomography. It has several advantages regarding cost, radiation dose, and lack of scatter when used for postoperative assessment.
Seok-woo Kim - One of the best experts on this subject based on the ideXlab platform.
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is it possible to evaluate the parameters of cervical sagittal alignment on cervical computed tomographic scans
Spine, 2014Co-Authors: Hyo Sub Jun, Moon Soo Park, Tae Hwan Kim, In Bok Chang, Joon Ho Song, Seok-woo KimAbstract:Study design Retrospective study. Objective The purpose of this study was to analyze the relationship of the parameters of cervical sagittal alignment between those obtained from cervical CT and those obtained from Radiography, as well as to determine which parameter would help predict physiological lordosis of the cervical spine. Summary of background data Sagittal balance in the cervical spine is as important as the pelvic incidence and is related to the concept of T1 slope. However, many articles including this article based on unclear cervical x-ray Radiographs could weakly explain the parameters. To overcome the fundamental limitation of x-ray Radiographs, Hallym University Sacred Heart Hospital reported the strong correlation between T1 slope and cervical lordosis on the cervical dimensional CT scans like result by checking by the cervical x-ray Radiographs. Methods A retrospective analysis of data from 50 asymptomatic adults in whom both cervical CT scans and cervical Radiograph were obtained at the same time. The T1 slope, Cobb angle C2-C7, neck tilt, and thoracic inlet angle (TIA) obtained from the CT scans and Radiographs were assessed. Results The T1 slope on x-ray was significantly correlated with the T1 slope on CT. The mean of the T1 slope on x-ray was larger than the mean of the T1 slope on CT (3.3° ± 6.1°). More cervical spine lordosis was evident on the cervical Radiograph than on the cervical CT scan (5.93° ± 9.0°). No significant difference was seen between the TIA on x-ray and the TIA on CT (TIA on x-ray - TIA on CT, -0.1 ± 7.6, P = 0.959). Conclusion This difference may be due to the differing effect of gravity upon the spine between the upright versus the supine position. Accordingly, TIA and T1 slope may be used as a guide for the assessment of sagittal balance of the cervical spine.
F. A. Mann - One of the best experts on this subject based on the ideXlab platform.
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lateral Radiography of the cervical spine in the trauma patient looking beyond the spine
American Journal of Roentgenology, 2001Co-Authors: Jonathan R Perry, F. A. Mann, Eric J Stern, Alexander B BaxterAbstract:381 n the traumatized patient, the crosstable lateral cervical spine Radiograph is commonly obtained immediately on arrival in the emergency department, along with a chest Radiograph and pelvis Radiograph. These three Radiographs—the trauma series— are obtained to rapidly screen for life-threatening injuries. With the cervical spine Radiograph, there is a tendency to focus on the spine itself. The careful observer can find other clues to injuries that are exclusive of the spine. Although many of these injuries are better evaluated with Lateral Radiography of the Cervical Spine in the Trauma Patient: Looking Beyond the Spine
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Evaluation of the injured cervical spine: comparison of conventional and storage phosphor Radiography with a hybrid cassette.
Radiology, 1994Co-Authors: Anthony J. Wilson, F. A. Mann, O. Clark West, Kevin W. Mcenery, William A. MurphyAbstract:PURPOSE: To compare conventional and storage phosphor Radiography of the injured cervical spine. MATERIALS AND METHODS: Sixty-five patients underwent imaging in a supine position while wearing a cervical collar. Matched storage phosphor and conventional lateral cervical spine Radiographs were obtained with an 18 x 24-cm hybrid cassette. Edge-enhanced and nonenhanced copies of each computed Radiograph were printed on film, and the images were sent via a computer network to a remote imaging workstation. Four radiologists read the conventional Radiographs, the two hard-copy computed Radiographs, and the soft-copy images and used a binary scale to score the visibility of bone and soft-tissue structures. RESULTS: All readers scored better in all areas with computed Radiographs, and a statistically significant (P = .030) improvement in performance was seen for soft-tissue structures. CONCLUSION: Storage phosphor imaging offers advantages over conventional Radiography, and digital images may be a viable alternat...
Daniel K Riew - One of the best experts on this subject based on the ideXlab platform.
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does whole spine lateral Radiograph with clavicle positioning reflect the correct cervical sagittal alignment
European Spine Journal, 2015Co-Authors: Sangmin Park, Kwang Sup Song, Seung Hwan Park, Hyun Kang, Daniel K RiewAbstract:To evaluate the differences of cervical alignment between standing cervical lateral Radiograph and whole-spine lateral Radiograph with clavicle position. We prospectively evaluated 101 asymptomatic adults from whom standing cervical lateral Radiograph with hands on both side followed by whole-spine lateral Radiographs with clavicle position were obtained from April 2012 to December 2013. On two Radiographs, cervical sagittal alignment from C2 to C7 was analyzed by Gore angle (GA) and Cobb angle (CA); head position was evaluated using the translation distance (TD, distance of the anterior tubercle of C1 compared with the vertical line through the posterior-inferior body of C7) and McGregor angle (MA, angle between the McGregor and horizontal lines). T1-slope was also evaluated. Cervical alignment on the cervical Radiograph (GA −13.59° [−15.58 to −11.60], CA −9.76° [−11.65 to −7.86]) was significantly more lordotic than that on whole-spine Radiographs (GA −6.28° [−8.65 to −3.91] and −4.14° [−6.40 to −1.89]). TD and MA on cervical Radiographs (TD 34.98 mm [33.22–36.75]; MA 7.20° [6.35–8.35]) were meaningfully higher than those on whole-spine Radiographs (TD 31.31 mm [29.47–33.16]; MA 6.32° [5.25–7.39]), but the MA values were not significant (p = 0.064). T1-slope was significantly lower in whole-spine Radiographs (20.11° [18.88–21.35]) than in cervical Radiographs (24.37° [23.14–25.6]). Values are expressed as mean (95 % confidence interval). Clavicle position during whole-spine Radiograph caused a substantial decrease in the T1-slope; head position posteriorly translated followed by the cervical sagittal alignment became more hypo-lordotic, with slight downward gazing in comparison with the cervical Radiograph.
