Assessment of regional wall motion abnormality without contrast medium by digital subtraction angiography using Fourier analysis

Ikeda, Hisao; Shibao, Keigo; Yoh, Masayoshi; Shimamatsu, Masayoshi; Shibata, Hiromichi; Hiyamuta, Kohji; Ohkita, Yasuo; Sugi, Kenzo; Koga, Yoshinori; Utsu, Fumihiko; Toshima, Hironori

doi:10.1007/bf02066417

Cited by 4 publications

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“…Digital subtraction angiography (DSA) has various applications in clinical cardiology (Mistretta et al 1982), including the diagnosis of aortic aneurysm, and congenital malformation, as well as the assessment of cardiac function (Ikeda et al 1985;Higgins et al 1982;Engels et al 1982;Nichols et al 1983., Tobis et al 1984. One of the fundamental methods for hemodynamic study is a serial volume assessment of the heart chambers.…”

Section: Introductionmentioning

confidence: 99%

Computer videodensitometry of digital subtraction angiography for measurement of the cardiac volume.

et al. 1984

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Section: Introductionmentioning

confidence: 99%

Computer videodensitometry of digital subtraction angiography for measurement of the cardiac volume.

et al. 1984

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Quantitative evaluation of regional myocardial blood flow by videodensitometric analysis of digital subtraction coronary arteriography in humans

Ikeda¹,

Koga²,

Utsu³

et al. 1986

Journal of the American College of Cardiology

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Videodensitometric analysis of digital subtraction coronary arteriography, a new approach for calculating contrast disappearance half-life (T1/2), was assessed in determining regional myocardial blood flow quantitatively. Forty-one patients with coronary artery disease and 12 with angiographically normal coronary arteries underwent digital subtraction coronary arteriography by manual injection of contrast medium into the left main coronary artery. The T1/2 was calculated from a time-density curve generated in the four sectors of the myocardium perfused by the left anterior descending coronary artery. The mean T1/2 value of the four sectors correlated inversely with the great cardiac vein flow measured by the thermodilution method (r = -0.89), and appeared to be a reliable index of myocardial blood flow. The relation of mean T1/2 with percent stenosis of the left anterior descending coronary artery was curvilinear (r = 0.88) and an abnormally high T1/2 occurred in patients with coronary stenosis greater than 75%. In patients with comparable stenosis of the left anterior descending artery, the apical T1/2 was significantly increased in those with impaired apical wall motion, while it was significantly decreased in those with coronary collateral vessels. These findings suggest that regional myocardial blood flow begins to decrease in vessels with greater than 75% stenosis, and that myocardial contraction and collateral flow are additional factors that modify regional myocardial blood flow. Thus, the contrast disappearance half-life (T1/2) derived by computerized washout analysis of digital subtraction coronary arteriograms proved useful as an index for quantitative evaluation of regional myocardial blood flow.

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Identifying and tracking a guide wire in the coronary arteries during angioplasty from X-ray images

Palti-Wasserman

Brukstein

Beyar

1997

IEEE Trans. Biomed. Eng.

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During angioplasty, a guide wire (GW) is routinely placed in the coronary artery. Balloon inflation during angioplasty causes transient occlusion of the coronary artery and regional dysfunction. Thus, it is of major importance to monitor myocardial function, which may be impaired during this period. Since the GW moves with the coronary arteries, information regarding myocardial function can potentially be extracted from the GW motion. An algorithm is suggested which is a step toward such monitoring. The algorithm presented is a semiautomatic procedure for identifying and tracking the GW using specific characteristics of the GW. This algorithm is based on working in limited active windows. A preprocessing stage which enhances the GW by the use of a modified Laplacian filter or a modified Marr-Hildreth filter is introduced. The second stage of the algorithm is the tracking of the GW, which is based on fitting a second-degree polynomial to the GW using the Hough transform in each window. To further improve the results further modifications of the basic algorithms that were taken. A single set of parameters, which enabled good tracking for a large number of images taken during angioplasty, was fitted to the final algorithm.

show abstract

Assessment of regional wall motion abnormality without contrast medium by digital subtraction angiography using Fourier analysis

Cited by 4 publications

References 1 publication

Computer videodensitometry of digital subtraction angiography for measurement of the cardiac volume.

Computer videodensitometry of digital subtraction angiography for measurement of the cardiac volume.

Quantitative evaluation of regional myocardial blood flow by videodensitometric analysis of digital subtraction coronary arteriography in humans

Identifying and tracking a guide wire in the coronary arteries during angioplasty from X-ray images

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