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Biplane

About: Biplane is a(n) research topic. Over the lifetime, 513 publication(s) have been published within this topic receiving 8651 citation(s).

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Journal ArticleDOI
Harold Sandler1, Harold T. Dodge1Institutions (1)
TL;DR: Volumes calculated from measurements made only on A-P films closely agreed with biplane calculations of volume and the use of single plane techniques did not result in significant errors for the calculation of absolute end-systolic volume or for calculation of stroke volume.

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Abstract: A method has been presented for calculating LVV from films taken in a single (A-P) plane projection. This method is based on the assumption that the LV chamber can be represented by an ellipsoid of revolution (prolate spheroid) reference figure. LV volumes were calculated from measurements made on biplane films taken in the A-P and left lateral chest projections. The biplane studies demonstrated that the A-P and lateral diameters of the ventricular chamber were very closely related. Volumes calculated from measurements made only on A-P films closely agreed with biplane calculations of volume. The use of single plane techniques did not result in significant errors for the calculation of absolute end-systolic volume or for calculation of stroke volume.

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1,076 citations


Journal ArticleDOI
01 Sep 1979-Circulation
TL;DR: The volumes determined from the minor-axis dimensions of M-mode echograms in 23 of the same patients correlated poorly with angiography, and the volumes determined with a modified Simpson's rule formula determined systolic and diastolic left ventricular volumes from the bi plane echogram and the biplane angiogram.

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Abstract: To evaluate the applicability of two-dimensional echocardiography to left ventricular volume determination, 30 consecutive patients undergoing biplane left ventricular cineangiography were studied with a wide-angle (84 degrees), phased-array, two-dimensional echocardiographic system. Two echographic projections were used to obtain paired, biplane, tomographic images of the left ventricle. We used the short-axis view (from the precordial window) as an anolog of the left anterior oblique angiogram, and the long-axis, two-chamber view (from the apex impulse window) as a right anterior oblique angiographic equivalent. A modified Simpson's rule formula was used to calculate systolic and diastolic left ventricular volumes from the biplane echogram and the biplane angiogram. These methods correlated well for ejection fraction (r = 0.87) and systolic volume (r = 0.90), but only modestly for diastolic volume (r = 0.80). These correlations are noteworthy because 65% of the patients had significant segmental wall motion abnormalities. The volumes determined from the minor-axis dimensions of M-mode echograms in 23 of the same patients correlated poorly with angiography.

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599 citations


Journal ArticleDOI
Scott Tashman1, William Anderst1Institutions (1)
TL;DR: A novel technique for measuring in-vivo skeletal kinematics that combines data collected from high-speed biplane radiography and static computed tomography is presented, with advantages over traditional motion analysis methods including the elimination of skin motion artifacts, improved tracking precision and the ability to present results in a consistent anatomical reference frame.

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Abstract: Dynamic assessment of three-dimensional (3D) skeletal kinematics is essential for understanding normal joint function as well as the effects of injury or disease. This paper presents a novel technique for measuring in-vivo skeletal kinematics that combines data collected from high-speed biplane radiography and static computed tomography (CT). The goals of the present study were to demonstrate that highly precise measurements can be obtained during dynamic movement studies employing high frame-rate biplane video-radiography, to develop a method for expressing joint kinematics in an anatomically relevant coordinate system and to demonstrate the application of this technique by calculating canine tibio-femoral kinematics during dynamic motion. The method consists of four components: the generation and acquisition of high frame rate biplane radiographs, identification and 3D tracking of implanted bone markers, CT-based coordinate system determination, and kinematic analysis routines for determining joint motion in anatomically based coordinates. Results from dynamic tracking of markers inserted in a phantom object showed the system bias was insignificant (-0.02 mm). The average precision in tracking implanted markers in-vivo was 0.064 mm for the distance between markers and 0.31 degree for the angles between markers. Across-trial standard deviations for tibio-femoral translations were similar for all three motion directions, averaging 0.14 mm (range 0.08 to 0.20 mm). Variability in tibio-femoral rotations was more dependent on rotation axis, with across-trial standard deviations averaging 1.71 degrees for flexion/extension, 0.90 degree for internal/external rotation, and 0.40 degree for varus/valgus rotation. Advantages of this technique over traditional motion analysis methods include the elimination of skin motion artifacts, improved tracking precision and the ability to present results in a consistent anatomical reference frame.

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282 citations


9


Journal ArticleDOI
William Anderst1, Roger Zauel2, Jennifer Bishop2, Erinn Demps2  +1 moreInstitutions (2)
TL;DR: The combination of high-speed biplane radiography and volumetric model-based tracking achieves excellent accuracy during in vivo, dynamic knee motion without the necessity for invasive bead implantation.

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Abstract: The purpose of this study was to determine the accuracy of a radiographic model-based tracking technique that measures the three-dimensional in vivo motion of the tibio-femoral joint during running. Tantalum beads were implanted into the femur and tibia of three subjects and computed tomography (CT) scans were acquired after bead implantation. The subjects ran 2.5m/s on a treadmill positioned within a biplane radiographic system while images were acquired at 250 frames per second. Three-dimensional implanted bead locations were determined and used as a "gold standard" to measure the accuracy of the model-based tracking. The model-based tracking technique optimized the correlation between the radiographs acquired via the biplane X-ray system and digitally reconstructed radiographs created from the volume-rendered CT model. Accuracy was defined in terms of measurement system bias, precision and root-mean-squared (rms) error. Results were reported in terms of individual bone tracking and in terms of clinically relevant tibio-femoral joint translations and rotations (joint kinematics). Accuracy for joint kinematics was as follows: model-based tracking measured static joint orientation with a precision of 0.2 degrees or better, and static joint position with a precision of 0.2mm or better. Model-based tracking precision for dynamic joint rotation was 0.9+/-0.3 degrees , 0.6+/-0.3 degrees , and 0.3+/-0.1 degrees for flexion-extension, external-internal rotation, and ab-adduction, respectively. Model-based tracking precision when measuring dynamic joint translation was 0.3+/-0.1mm, 0.4+/-0.2mm, and 0.7+/-0.2mm in the medial-lateral, proximal-distal, and anterior-posterior direction, respectively. The combination of high-speed biplane radiography and volumetric model-based tracking achieves excellent accuracy during in vivo, dynamic knee motion without the necessity for invasive bead implantation.

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218 citations


Journal ArticleDOI
TL;DR: A three-dimensional model-based method is presented to estimate skeletal motion of the knee from high-speed sequences of biplane radiographs, which implicitly assumes that geometrical features cannot be detected reliably and an exact segmentation of bone edges is not always feasible.

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Abstract: Current noninvasive or minimally invasive methods for evaluating in vivo knee kinematics are inadequate for accurate determination of dynamic joint function due to limited accuracy and/or insufficient sampling rates. A three-dimensional (3-D) model-based method is presented to estimate skeletal motion of the knee from high-speed sequences of biplane radiographs. The method implicitly assumes that geometrical features cannot be detected reliably and an exact segmentation of bone edges is not always feasible. An existing biplane radiograph system was simulated as two separate single-plane radiograph systems. Position and orientation of the underlying bone was determined for each single-plane view by generating projections through a 3-D volumetric model (from computed tomography), and producing an image (digitally reconstructed radiograph) similar (based on texture information and rough edges of bone) to the two-dimensional radiographs. The absolute 3-D pose was determined using known imaging geometry of the biplane radiograph system and a 3-D line intersection method. Results were compared to data of known accuracy, obtained from a previously established bone-implanted marker method. Difference of controlled in vitro tests was on the order of 0.5 mm for translation and 1.4/spl deg/ for rotation. A biplane radiograph sequence of a canine hindlimb during treadmill walking was used for in vivo testing, with differences on the order of 0.8 mm for translation and 2.5/spl deg/ for rotation.

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205 citations


9


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20218
202019
201913
201818
201716
201615

Top Attributes

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Topic's top 5 most impactful authors

Kazuhiro Kusunose

13 papers, 150 citations

Shigeru Obayashi

12 papers, 85 citations

Daigo Maruyama

12 papers, 134 citations

Dietrich G. W. Onnasch

6 papers, 35 citations

Scott Tashman

6 papers, 830 citations