This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)
All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.
Segmental contractions of the left ventricle (LV) were quantified from ECG-gated single-photon emission computed
tomography. Counts were integrated in 64 divided angles about the center on short-axis images and projected onto a virtual
cylindrical screen. Changes in the projected count obey the equation of continuity for two-dimensional fluids. Displacements
of pixel point were calculated from the velocity field, and the amounts of dislocation on this virtual screen were quantified.
Changes in the position of each pixel point were projected back on the cardiac wall to configure a motion wireframe.
Deformations of wireframe were displayed on a monitor. Myocardial contractions, temporal correlation coefficients between
LV volume and contraction (synchronous contraction index, SCI, which were introduced for the assessment of synchronicity
of LV contraction), and contraction work (RCW, in unit of mJ/cm2/beat) were calculated.
This method, Quantification of Segmental Function by solving the Poisson equation (QSFP) is quite different from the
wall-motion, or wall-thickening methods, which use the external coordinate systems. Satisfactory results were obtained
for numerical computer models of uneven eccentric contractions, and rotation models of LV. It enables us to realize
quantification of contraction parallel to the LV wall by using coordinate system fixed on LV wall. QSFP is expected to be a
useful tool for physicians to analyze the abnormal contraction in the patients with various heart diseases, such as coronary
artery diseases and cardiomyopathy
Hisatoshi Maeda is a Professor of Emeritus at Nagoya University. He got MS in engineering from Tokyo University and MD from Kyoto University, and has finished
Ph.D. at California Institute of Technology.
Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals