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TRANSDUCER ARRAY, PHOTOACOUSTIC PROBE, AND PHOTOACOUSTIC MEASURING DEVICE NEW

外国特許コード F180009559
整理番号 (S2017-0545-N0)
掲載日 2018年11月2日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP008480
国際公開番号 WO 2018168562
国際出願日 平成30年3月6日(2018.3.6)
国際公開日 平成30年9月20日(2018.9.20)
優先権データ
  • 特願2017-053502 (2017.3.17) JP
発明の名称 (英語) TRANSDUCER ARRAY, PHOTOACOUSTIC PROBE, AND PHOTOACOUSTIC MEASURING DEVICE NEW
発明の概要(英語) Provided is a transducer array which both improves sensitivity and suppresses unnecessary responses. In a transducer array (20) provided with a plurality of transducer elements (21) capable of detecting ultrasound waves, the positions of the centers of gravity of the plurality of transducer elements (21) are arranged at random in a two-dimensional shape, and the plurality of transducer element (21) are disposed adjacent to one another without a gap.
従来技術、競合技術の概要(英語) BACKGROUND ART
Using the photo-acoustic effect of the inspected object such as a living organism (photoacoustic imaging) image of the interior of the light in the photoacoustic measurement apparatus has been known.The imaging is carried out, firstly the acoustic measuring device for a living body is irradiated with light for a predetermined wavelength.Then, the inside of a living body substances contained in the absorbing light energy, with the thermal expansion of the living tissue, light in the elastic wave to an acoustic wave is generated.Then, the photoacoustic measuring device, the light is detected as an ultrasonic acoustic wave.Further, the detected light is light based on the acoustic signal the acoustic measuring device to create a photoacoustic image, a photo-acoustic imaging is performed.
Capable of detecting ultrasonic transducer elements (hereinafter, sometimes referred to as' elements '.) Configured by disposing a plurality of the transducer array (hereinafter, sometimes referred to as' array '.) Is, used in photoacoustic imaging.Using a transducer array, electronically receive beam can be deflected (steering).In particular, elements are arranged two-dimensionally in the case, the steering of the beam can be received over a three-dimensional, three-dimensional interior of the test subject can be captured.
In order to improve the sensitivity of the array, increase the solid angle of the opening of the transducer array, it is possible to densely arrange the elements is performed.Thus, S/N ratio can be improved, as a result, the deeper inspection can be performed.In order to improve further the sensitivity of the array is, the electrical impedance of the element, the element connected to the electrical impedance of the cable and the input impedance of the preamplifier are equal to or less than or equal to the desired.In this case, the size of the device needs to be increased to some extent.However, receives an ultrasonic wave to the wavelength λ λ/2 of the size of the device becomes larger than, smaller than λ/2 the distance between the element becomes difficult.Further at this time, if the device arranged at regular intervals, the unnecessary response due to the occurrence of grating lobes increases.Among them, when the steer the receive beam, the grating lobe will be greatly affected.
To suppress the occurrence of grating lobes, an element arranged at equal intervals has been attempted.For example, in Patent Document 1, the logarithmic spiral along the radii of the plurality of devices are arranged at intervals in the array is disclosed.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • TOHOKU UNIVERSITY
  • 発明者(英語)
  • Umemura Shinichiro
  • Yoshifumi Saijo
  • Susumu Yoshizawa
  • Ryo Takagi
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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