초음파 SPI 원리 초음파 물리2

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"초음파 SPI 원리 초음파 물리2"에 대한 내용입니다.

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1.pulser 2.Beam former 3.Transducer 4 \.Receiver 5.Memory 6.Display
* In order: Pulser → Beam former → Transducer → Receiver → Memory (scan converter) → Display
* Analog signal
- does not have discrete steps –
values may vary continuously between minimum and maximum point
(continuous variation of the signal is possible)
* Digital signal
- have discrete values that have fixed steps between values
- bits determine levels in digital system
1. Pulser (= Voltage Generator, Transmitter) [★]
1) originates action
2) Sends an Electric voltage pulse (EVP) to transducer through the beam former
- EVP (electric) = analog part
- Starting piezoelectric effect
3) Output power control
- adjust to increase or decrease the intensity of transmitted pulse
- output power: most closely affects patient exposure
4) PRF (Pulse repetition frequency) of Pulser = PRF of Transducer
2. Beam Former [★★]
1) Sends EVP to Transducer.
- EVP (electric) = analog part
2) Responsible for
- Aperture control
- Beam steering

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