Advanced ultrasound probes for medical imaging

Wildes, Douglas; Smith, L.S.

doi:10.1063/1.4716307

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…In-probe electronics are used in hand-held external probes, such as those used for 3D pregnancy ultrasound or transthoracic echocardiography, to connect thousands of individual transducer elements to typically 128 system channels of an imaging system [4][5][6][7][8][9][10][11][12][13][14]. Miniaturized integrated circuits for use in endoscope-based probes have also been reported [3,6,[15][16][17][18].…”

Section: Channel-reduction Approachesmentioning

confidence: 99%

Low-power receive electronics for a miniature real-time 3D ultrasound probe

Pertijs

Chen

Raghunathan

et al. 2015

2015 6th International Workshop on Advances in Sensors and Interfaces (IWASI)

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Transesophageal echocardiography (TEE) involves the use of an ultrasound transducer mounted at the tip of an endoscope to make ultrasonic images of the human heart from the esophagus. In conventional TEE probes, each transducer element is wired-out by a micro-coaxial cable to an external imaging system. To obtain real-time three-dimensional images, however, a two-dimensional transducer array with more than 1000 elements is required. Direct wiring of so many elements through an endoscope is not feasible, so channel reduction should be performed locally. In this paper, we present an applicationspecific integrated circuit (ASIC) that includes low-noise amplifiers, programmable-gain amplifiers and microbeamformer circuits that locally process and combine the signals received by sub-groups of the transducer array. Thus, an orderof-magnitude channel reduction is achieved. The acoustic characterization of the prototype ASIC with a co-integrated transducer array will be presented.

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Section: Channel-reduction Approachesmentioning

confidence: 99%

Low-power receive electronics for a miniature real-time 3D ultrasound probe

Pertijs

Chen

Raghunathan

et al. 2015

2015 6th International Workshop on Advances in Sensors and Interfaces (IWASI)

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“…However, three-dimensional (3D) ultrasound imaging allows physicians to use ultrasound to view pathology as a volume and thus improve their comprehension of the patient's anatomy. [2][3][4][5] Volumetric ultrasound images permit more accurate diagnoses and thus provide the clinician with more confidence in their diagnosis of diseases. [6][7][8][9] Work on 3D visualization began in the early 1980s.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic transducers for medical volumetric imaging

Roh

2014

Jpn. J. Appl. Phys.

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Three-dimensional (3D) ultrasound imaging allows physicians to use ultrasound to view pathology as a volume in order to enhance the comprehension of a patient's anatomy. In this paper, the modality of 3D ultrasound imaging is described in accordance with the development of transducer technology. Two representative types of 3D imaging transducers are reviewed with description of the concept and operation principle of each type: mechanical transducer and matrix array transducer. Mechanical transducers are further divided into free-hand scanning and sequential scanning types. Matrix array transducers are also detailed into piezoelectric (single-unit and module-assembly type) transducers and capacitive micromachined ultrasound transducers. Advantages of each transducer and technical issues for further performance enhancement are discussed.

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“…However, 3D ultrasound imaging allows physicians to use ultrasound to view pathology as a volume, thereby improving the comprehension of patient anatomy. 1) Transducers to obtain 3D images fall into two types; (1) wobbler transducers that acquire multiple cross-sectional images by mechanically reciprocating the 1D array transducer and obtain 3D images by combining the multiple crosssectional images, [2][3][4][5][6][7][8][9] and (2) 2D array ultrasonic transducers that obtain 3D images directly by arranging the piezoelectric elements in a 2D array form. [10][11][12][13][14] The 2D array transducer can be considered a multiple linear connection of 1D phased array transducers.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic two-dimensional array transducer of the single-unit type with a conductive backing of the 1–3 piezocomposite structure

Woo¹,

Roh²

2014

Jpn. J. Appl. Phys.

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Objective. The bedside detection of potential awareness in patients with disorders of consciousness (DOC) currently relies only on behavioral observations and tests; however, the misdiagnosis rates in this patient group are historically relatively high. In this study, we proposed a visual hybrid brain-computer interface (BCI) combining P300 and steady-state evoked potential (SSVEP) responses to detect awareness in severely brain injured patients. Approach. Four healthy subjects, seven DOC patients who were in a vegetative state (VS, n = 4) or minimally conscious state (MCS, n = 3), and one locked-in syndrome (LIS) patient attempted a command-following experiment. In each experimental trial, two photos were presented to each patient; one was the patientʼs own photo, and the other photo was unfamiliar. The patients were instructed to focus on their own or the unfamiliar photos. The BCI system determined which photo the patient focused on with both P300 and SSVEP detections. Main results. Four healthy subjects, one of the 4 VS, one of the 3 MCS, and the LIS patient were able to selectively attend to their own or the unfamiliar photos (classification accuracy, 66-100%). Two additional patients (one VS and one MCS) failed to attend the unfamiliar photo (50-52%) but achieved significant accuracies for their own photo (64-68%). All other patients failed to show any significant response to commands (46-55%). Significance. Through the hybrid BCI system, command following was detected in four healthy subjects, two of 7 DOC patients, and one LIS patient. We suggest that the hybrid BCI system could be used as a supportive bedside tool to detect awareness in patients with DOC.

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Advanced ultrasound probes for medical imaging

Cited by 10 publications

References 18 publications

Low-power receive electronics for a miniature real-time 3D ultrasound probe

Low-power receive electronics for a miniature real-time 3D ultrasound probe

Ultrasonic transducers for medical volumetric imaging

Ultrasonic two-dimensional array transducer of the single-unit type with a conductive backing of the 1–3 piezocomposite structure

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