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Kikuchi, Fumitoshi; Sato, Taku; Abe, Tsuneyuki

doi:10.4092/jsre.21.2

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…The National Metrology Institute of Japan (NMIJ) has established the ultrasonic power standard by the RFB method, 11) covering the frequency range from 0.5 to 20 MHz and the power range from 1 mW to 15 W. 14,15) The RFB method relies on the principle that when travelling ultrasound is incident to the absorbing target, a force proportional to ultrasonic power is generated, in the case of a plane wave. Force is measured as a change in the weight of the absorbing target using an electric balance.…”

Section: Radiation Force Balance Methodsmentioning

confidence: 99%

Effect of Heat Generation of Ultrasound Transducer on Ultrasonic Power Measured by Calorimetric Method

Uchida¹,

Kikuchi²

2013

Jpn. J. Appl. Phys.

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Ultrasonic power is one of the key quantities closely related to the safety of medical ultrasonic equipment. An ultrasonic power standard is required for establishment of safety. Generally, an ultrasonic power standard below approximately 20 W is established by the radiation force balance (RFB) method as the most accurate measurement method. However, RFB is not suitable for high ultrasonic power because of thermal damage to the absorbing target. Consequently, an alternative method to RFB is required. We have been developing a measurement technique for high ultrasonic power by the calorimetric method. In this study, we examined the effect of heat generation of an ultrasound transducer on ultrasonic power measured by the calorimetric method. As a result, an excessively high ultrasonic power was measured owing to the effect of heat generation from internal loss in the transducer. A reference ultrasound transducer with low heat generation is required for a high ultrasonic power standard established by the calorimetric method.

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Section: Radiation Force Balance Methodsmentioning

confidence: 99%

Effect of Heat Generation of Ultrasound Transducer on Ultrasonic Power Measured by Calorimetric Method

Uchida¹,

Kikuchi²

2013

Jpn. J. Appl. Phys.

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“…One way to measure ultrasonic power is by the radiation force balance (RFB) [14][15][16][17][18][19] method, which calculates ultrasonic power from changes in the weight of a target exposed to ultrasound. The target mainly consists of polyurethane rubber, and its weight change is measured using an electronic balance.…”

Section: Introductionmentioning

confidence: 99%

Effect of dissolved oxygen level of water on ultrasonic power measured using calorimetry

Uchida¹,

Yoshioka²,

Horiuchi³

2018

Jpn. J. Appl. Phys.

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Ultrasonic therapeutic equipment, which exposes the human body to high-power ultrasound, is used in clinical practice to treat cancer. However, the safety of high-power ultrasound has been questioned because the equipment affects not only cancer cells but also normal cells. To evaluate the safety of ultrasound, it is necessary to accurately measure the ultrasonic power of the equipment. This is because ultrasonic power is a key quantity related to the thermal hazard of ultrasound. However, precise techniques for measuring ultrasonic power in excess of 15 W are yet to be established. We have been studying calorimetry as a precise measurement technique. In this study, we investigated the effect of the dissolved oxygen (DO) level of water on ultrasonic power by calorimetry. The results show that the measured ultrasonic power differed significantly between water samples of different DO levels. This difference in ultrasonic power arose from acoustic cavitation.

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Cited by 2 publications

References 1 publication

Effect of Heat Generation of Ultrasound Transducer on Ultrasonic Power Measured by Calorimetric Method

Effect of Heat Generation of Ultrasound Transducer on Ultrasonic Power Measured by Calorimetric Method

Effect of dissolved oxygen level of water on ultrasonic power measured using calorimetry

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