{"id":1386,"date":"2010-07-07T09:45:15","date_gmt":"2010-07-07T13:45:15","guid":{"rendered":"https:\/\/wpmu2.mit.local\/?p=1386"},"modified":"2010-07-07T09:45:15","modified_gmt":"2010-07-07T13:45:15","slug":"architecture-design-and-transmitter-for-portable-ultrasound-systems","status":"publish","type":"post","link":"https:\/\/wpmu2.mit.local\/architecture-design-and-transmitter-for-portable-ultrasound-systems\/","title":{"rendered":"Architecture Design and Transmitter for Portable Ultrasound Systems"},"content":{"rendered":"

The Capacitive Micromachined Ultrasound Transducer (CMUT) is an alternative to traditional piezoelectric transducers. The CMUT technology provides an opportunity for highly integrated ultrasound-imaging system solutions because of its CMOS compatibility, ease of large array fabrication, and improved bandwidth and sensitivity performance [1<\/a>]<\/sup>.<\/p>\n

\"Figure<\/a>

Figure 1: The architecture of a 3D ultrasound imaging system with CMUT devices.<\/p><\/div>\n

This project aims to provide a highly flexible platform for 3D ultrasound imaging. Figure 1 presents the system architecture. The CMUT device is flip-chip bonded to the supporting electronic circuits, which eliminates the cables that are usually required by traditional systems between the piezoelectric transducers and circuits. As a result, the channel count of the imaging system is increased and the capacitive loading due to cables is greatly reduced. The transmitters in the system are reconfigurable to implement Tx Beamforming; the analog front-end receivers and the DSP perform various Rx Beamforming algorithms from the received echo waveforms.<\/p>\n

The transmitters generate high-voltage electric pulses to drive the CMUT device. The pulse magnitude should be as large as the process allows, with programmable pulse frequency at 1~10MHz and pulse duration at about 0.5~20us. In order to further increase the transmitted signal power within the transducer bandwidth, transmitter pulse-shaping is desirable. Direct waveform synthesis [2<\/a>]<\/sup> or PWM modulation [3<\/a>]<\/sup> are possible realizations of the transmitter pulse-shaping.<\/p>\n

We will implement a 2D ultrasound-imaging system based on a 1D transducer and corresponding electronics as the first step. Afterwards, a 3D ultrasound-imaging system using 2D transducers will be investigated.<\/p>\n

\r\nReferences
  1. O. Oralkan, \u201cAcoustical Imaging Using Capacitive Micromachined Ultrasonic Transducer Arrays: Devices, Circuits, and systems,\u201d Ph.D. dissertation, Stanford University, Palo Alto, CA, 2004. [↩<\/a>]<\/li>
  2. P. Mercier, D. Daly, and A. Chandrakasan, \u201cAn Energy-Efficient All-Digital UWB Transmitter Employing Dual Capacitively-Coupled Pulse-Shaping Drivers,\u201d IEEE Journal of Solid-State Circuits<\/em>, vol. 44, no. 6, June 2009. [↩<\/a>]<\/li>
  3. A. Dancy and A. Chandrakasan, \u201cA Reconfigurable Dual Output Low Power Digital PWM Power Converter,\u201d ISLPED 98,<\/em> August 10-12, 1998 [↩<\/a>]<\/li><\/ol><\/div>","protected":false},"excerpt":{"rendered":"

    The Capacitive Micromachined Ultrasound Transducer (CMUT) is an alternative to traditional piezoelectric transducers. The CMUT technology provides an opportunity for…<\/p>\n<\/div>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[27],"tags":[17,67,21,4145,4052],"_links":{"self":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1386"}],"collection":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/comments?post=1386"}],"version-history":[{"count":2,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1386\/revisions"}],"predecessor-version":[{"id":1389,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1386\/revisions\/1389"}],"wp:attachment":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/media?parent=1386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/categories?post=1386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/tags?post=1386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}