candle
发表于 2025-3-28 18:25:33
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rheumatology
发表于 2025-3-28 20:17:24
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extemporaneous
发表于 2025-3-28 22:56:21
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Gourmet
发表于 2025-3-29 06:43:03
Intraluminal ultrasound guidance of transverse laser coronary atherectomy, requirements for these systems are proposed, and compared to the design features of a laser atherectomy system currently under development by Intra-Sonix. This system uses high resolution ultrasound for real-time guidance and control and is potentially capable of characterizing lesions and imaging
syncope
发表于 2025-3-29 08:08:25
Review of intracoronary Doppler catheters, Validation studies in the laboratory and in animals have shown that these catheters can accurately measure velocity from a small sample volume beside or ahead of the catheter tip. The Doppler transducers have been miniaturized enough (< 1 mm dia) to be mounted on subselective coronary catheters or
cortex
发表于 2025-3-29 14:08:42
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exceed
发表于 2025-3-29 15:58:15
Analysis of backscattered ultrasound from normal and diseased arterial wall,cic ultrasound. The short distance from transducer to tissue, fluid path, high frequencies, and special characteristics of the tissues of interest all contribute to making practical tissue characterization by measurement of the backscattered signal more probable in intra-arterial imaging. The proper
比赛用背带
发表于 2025-3-29 20:29:22
Clinical percutaneous imaging of coronary anatomy using an over-the-wire ultrasound catheter systemign and incorporates a phased array transducer at its tip. There are no moving parts. A 360° image is produced perpendicular to the catheter axis using a 20 MHz center frequency. A dedicated minicomputer is used for initial image processing, as well as enhancement and analysis. Initial studies using
使害羞
发表于 2025-3-30 02:08:37
Imaging artifacts in mechanically driven ultrasound catheters,ia this shaft to the rotating echo tip element. In practice, the tip does not identically ‘follow’ the rotation of the motor due to low torsional rigidity of the shaft, which creates artifacts in the displayed cross-sectional image. In order to visualize curved arteries such as the coronary arteries
作呕
发表于 2025-3-30 06:28:13
Design characteristics for intravascular ultrasonic catheters,ions are developed for calculating the forces affecting catheter passage in a blood vessel. These equations are applied to the problem of Judkins (transfemoral) coronary artery catheterization, using previously described anatomical information and catheter moduli values. The introduction force is ca