Abstract：
:During the study of velocities in the human ascending aorta it became necessary to establish a method for two-dimensional velocity profiles from discrete velocity data obtained from different heartbeats and with different techniques. A descriptive geometrical model was therefore developed and expanded to 16 elements each containing 16 constants by a serial optimising technique using a least-squares method. Published data from two different studies on velocity distribution in the ascending aorta comprising six subjects with normal aortic valves were used. Three-dimensional graphic displays of velocity profile at different time intervals of the heart cycle clearly show common features of distribution of velocity at a point 6 cm above the aortic valve. There was a pronounced skewness with clockwise rotation of the skewness direction during systole, reversed flow directed towards the left coronary sinus of Valsalva in late systole and early diastole concomitant with secondary flow augmentation along the opposite wall of the aorta. Consistent plane-symmetric features during the heart cycle could not be demonstrated.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Segadal Ldoi
10.1007/BF02442319subject
Has Abstractpub_date
1991-09-01 00:00:00pages
489-92issue
5eissn
0140-0118issn
1741-0444journal_volume
29pub_type
杂志文章abstract：:Breast cancer is the most common cancer among women globally, and the number of young women diagnosed with this disease is gradually increasing over the years. Mammography is the current gold-standard technique although it is known to be less sensitive in detecting tumors in woman with dense breast tissue. Detecting a...
journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
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journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
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更新日期：1999-03-01 00:00:00
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
pub_type： 杂志文章,评审
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journal_title：Medical & biological engineering & computing
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更新日期：2007-11-01 00:00:00
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journal_title：Medical & biological engineering & computing
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更新日期：2019-03-01 00:00:00
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
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journal_title：Medical & biological engineering & computing
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