長井 裕

Hiroshi NAGAI

日本光電工業株式会社

NihonKohden Corp.

キーワード :

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This paper presents the physical properties of ultrasound: 1. Differences between normal sound and ultrasound, 2. Propagation of ultrasound, 3. Different “modes” of the ultrasound equipment, 4. Different “scan systems” , 5. The four types of ultrasound transducers: single array, phased array, annular array and matrix array, 6. Differences in probe frequencies, 7. Theory of acoustic power reduction, and 8. Method of frequency grade.