Quantitative assessment of cross-sectional area of small pulmonary vessels in patients with COPD using inspiratory and expiratory MDCT

2013 ◽  
Vol 82 (10) ◽  
pp. 1804-1810 ◽  
Author(s):  
Yukiko Matsuura ◽  
Naoko Kawata ◽  
Noriyuki Yanagawa ◽  
Toshihiko Sugiura ◽  
Yoriko Sakurai ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Pulmonary Vessels

Usefulness of Coronal Reconstruction CT Images for Quantitative Evaluation of the Cross-Sectional Area of Small Pulmonary Vessels

2014 ◽  
Vol 21 (11) ◽  
pp. 1411-1415 ◽  
Author(s):  
Shin Matsuoka ◽  
Tsuneo Yamashiro ◽  
Shoichiro Matsushita ◽  
Akiyuki Kotoku ◽  
Atsuko Fujikawa ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Ct Images ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Pulmonary Vessels ◽  
The Cross

Abstract 13796: Quantitative Measurement of Cross sectional Area of Small Pulmonary Vessels Using High-resolution Ct in Chronic Thromboembolic Pulmonary Hypertension

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Toshihiko Sugiura ◽  
Nobuhiro Tanabe ◽  
Naoko Kawata ◽  
Yukiko Matsuura ◽  
Hajime Kasai ◽  
...  
Keyword(s):  
Pulmonary Hypertension ◽  
High Resolution ◽  
Chronic Thromboembolic Pulmonary Hypertension ◽  
Correlation Coefficients ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Pulmonary Vessels ◽  
Lung Area ◽  
Thromboembolic Pulmonary Hypertension

Background: It is generally recognized that there is narrowing and diminution of the small vessels on pulmonary angiography in patients with chronic thromboembolic pulmonary hypertension (CTEPH). Previous studies have shown that these vascular alterations could be assessed by the cross-sectional area of small pulmonary vessels (CSA) on high-resolution CT (HRCT) in patients with COPD. However, it is unknown whether there is a correlation between CSA and hemodynamics in patients with CTEPH. Aims: We retrospectively evaluated the relationship between the CSA on HRCT and hemodynamics measured by right heart catheterization (RHC). Materials and Methods: 61 patients (61±12 yrs, 13 male) with proven CTEPH underwent non-enhanced 64-slice HRCT (Aquilion ONE, Toshiba) and RHC. The HRCT images with 0.5 mm section thickness and 10 mm spacing were selected from all of the CT images in each patient. Using a semiautomatic image-processing program (Image J), CSA less than 5mm2 and 5-10mm2 , and total lung area were measured, and the percentage of the total CSA less than 5mm2 and 5-10mm2 for the lung area (%CSA<5 and %CSA5-10, respectively) were calculated. The correlations of %CSA with hemodynamics measured by RHC were evaluated. Results: Mean pulmonary arterial pressure (mPAP) and pulmonary vascular resistance (PVR) from RHC were 41±9 mmHg and 8.3±3.0 Wood Units, respectively. %CSA<5 and %CSA5-10 were 1.095±0.166% and 0.447±0.093 %, respectively. The correlation coefficients of %CSA<5 with mPAP and PVR were -0.45 (P<0.001) and -0.64 (P<0.001), respectively. The correlation coefficients of %CSA5-10 with mPAP and PVR were -0.20 (P=0.1) and -0.38 (P=0.002), respectively. Conclusions: This study suggests that %CSA<5 measured on HRCT is inversely correlated with PVR and can be used to evaluate hemodynamics in CTEPH subjects.

Influence of bronchodilator usage for the cross-sectional area of small pulmonary vessels in COPD patients

2016 ◽  
Author(s):  
Masao Takemura ◽  
Hiroki Nishine ◽  
Shin Matsuoka ◽  
Takeo Inoue ◽  
Masamithi Mineshita ◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Pulmonary Vessels ◽  
Copd Patients ◽  
The Cross

Pelvic Canal Narrowing Caused by Triple Pelvic Osteotomy in the Dog

1994 ◽  
Vol 07 (03) ◽  
pp. 110-113 ◽  
Author(s):  
D. L. Holmberg ◽  
M. B. Hurtig ◽  
H. R. Sukhiani
Keyword(s):  
Postoperative Complications ◽  
Pelvic Osteotomy ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Canal Width ◽  
Operative Complications ◽  
Post Operative Complications

SummaryDuring a triple pelvic osteotomy, rotation of the free acetabular segment causes the pubic remnant on the acetabulum to rotate into the pelvic canal. The resulting narrowing may cause complications by impingement on the organs within the pelvic canal. Triple pelvic osteotomies were performed on ten cadaver pelves with pubic remnants equal to 0, 25, and 50% of the hemi-pubic length and angles of acetabular rotation of 20, 30, and 40 degrees. All combinations of pubic remnant lengths and angles of acetabular rotation caused a significant reduction in pelvic canal-width and cross-sectional area, when compared to the inact pelvis. Zero, 25, and 50% pubic remnants result in 15, 35, and 50% reductions in pelvic canal width respectively. Overrotation of the acetabulum should be avoided and the pubic remnant on the acetabular segment should be minimized to reduce postoperative complications due to pelvic canal narrowing.When performing triple pelvic osteotomies, the length of the pubic remnant on the acetabular segment and the angle of acetabular rotation both significantly narrow the pelvic canal. To reduce post-operative complications, due to narrowing of the pelvic canal, overrotation of the acetabulum should be avoided and the length of the pubic remnant should be minimized.

DETERMINATION OF THE FUNCTION OF THE ROD’S CROSS-SECTIONAL AREA USING VIBRATION EIGENFREQUENCIES

2020 ◽  
Vol 0 (4) ◽  
pp. 19-24
Author(s):  
I.M. UTYASHEV ◽  
◽  
A.A. AITBAEVA ◽  
A.A. YULMUKHAMETOV ◽  
◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Variable Cross ◽  
Sectional Area ◽  
Longitudinal Vibrations ◽  
Cross Sectional ◽  
Method Error ◽  
Various Boundary Conditions ◽  
Elastic Fixation ◽  
Crosssectional Area

The paper presents solutions to the direct and inverse problems on longitudinal vibrations of a rod with a variable cross-sectional area. The law of variation of the cross-sectional area is modeled as an exponential function of a polynomial of degree n . The method for reconstructing this function is based on representing the fundamental system of solutions of the direct problem in the form of a Maclaurin series in the variables x and λ. Examples of solutions for various section functions and various boundary conditions are given. It is shown that to recover n unknown coefficients of a polynomial, n eigenvalues are required, and the solution is dual. An unambiguous solution was obtained only for the case of elastic fixation at one of the rod’s ends. The numerical estimation of the method error was made using input data noise. It is shown that the error in finding the variable crosssectional area is less than 1% with the error in the eigenvalues of longitudinal vibrations not exceeding 0.0001.

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