Development of a Mechanical Scanning Device With High-Frequency Ultrasound Transducer for Ultrasonic Capsule Endoscopy

Wang, Xingying; Seetohul, Vipin; Chen, Ruimin; Zhang, Zhiqiang; Qian, Ming; Shi, Zhehao; Yang, Ge; Mu, Peitian; Wang, Congzhi; Huang, Zhihong; Zhou, Qifa; Zheng, Hairong; Cochran, Sandy; Qiu, Weibao

doi:10.1109/tmi.2017.2699973

Cited by 45 publications

(29 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, sufficient resolution is achieved at 25 MHz to suggest a strong basis for USCE GI tract investigations and the other ultrasonic array and system parameters that were chosen have been demonstrated to be viable. The ability to distinguish layers is comparable to clinical work at 20 MHz [5], results are also comparable to previous work with mechanically scanned systems operating at 30 MHz [9].…”

Section: Discussionsupporting

confidence: 83%

“…Array-based systems now dominate use in diagnostic ultrasound, with mechanically scanned systems used only in niche applications. Mechanical scanning simplifies electronics and is therefore particularly attractive for USCE in its initial development [8], [9], [11]. USCE also has parallels with intravascular ultrasound (IVUS) in which sidelooking circular transducer arrays generating radial images are now relatively common [12]- [15] and it is this configuration that is considered here and in [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Simulation of a Ring-Shaped Linear Array for Microultrasound Capsule Endoscopy

Lay

Cox

Seetohul

et al. 2018

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Self Cite

View full text Add to dashboard Cite

Video capsule endoscopy (VCE) has significantly advanced visualization of the gastrointestinal tract since its introduction in the last 20 years. Work is now under way to combine VCE with microultrasound imaging. However, small maximum capsule dimensions, coupled with the electronics required to integrate ultrasound imaging capabilities, pose significant design challenges. This paper describes a simulation process for testing transducer geometries and imaging methodologies to achieve satisfactory imaging performance within the physical limitations of the capsule size and outlines many of the tradeoffs needed in the design of this new class of ultrasound capsule endoscopy (USCE) device. A hybrid MATLAB model is described, incorporating Krimholtz-Leedom-Matthaei circuit elements and digitizing and beamforming elements to render a gray-scale B-mode. This model is combined with a model of acoustic propagation to generate images of point scatterers. The models are used to demonstrate the performance of a USCE transducer configuration comprising a single, unfocused transmit ring of radius 5 mm separated into eight segments for electrical impedance control and a 512-element receive linear array, also formed into a ring. The MATLAB model includes an ultrasonic pulser circuit connected to a piezocrystal composite transmit transducer with a center frequency of 25 MHz. B-scan images are simulated for wire target phantoms, multilayered phantoms, and a gut wall model. To demonstrate the USCE system's ability to image tissue, a digital phantom was created from single-element ultrasonic transducer scans of porcine small bowel ex vivo obtained at a frequency of 45 MHz.

show abstract

Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Ring-Shaped Linear Array for Microultrasound Capsule Endoscopy

Lay

Cox

Seetohul

et al. 2018

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pulse-echo experiment is a basic indicator for performance tests such as ultrasonic systems or ultrasonic transducer configurations [ 4 , 9 ], and their performance can be estimated by measuring echo amplitudes, pulse-widths, harmonics, etc. [ 74 , 75 ]. Figure 13 a shows a picture of the experimental measurement environment.…”

Section: Resultsmentioning

confidence: 99%

Post-Voltage-Boost Circuit-Supported Single-Ended Class-B Amplifier for Piezoelectric Transducer Applications

Kim

You

Choi

2020

Sensors

View full text Add to dashboard Cite

Piezoelectric transducers are important devices that are triggered by amplifier circuits in mobile ultrasound systems. Therefore, amplifier performance is vital because it determines the acoustic piezoelectric transducer performances. Particularly, mobile ultrasound applications have strict battery performance and current consumption requirements; hence, amplifier devices should exhibit good efficiency because the direct current (DC) voltage in the battery are provided to the supply voltages of the amplifier, thus limiting the maximum DC drain voltages of the main transistors in the amplifier. The maximum DC drain voltages are related with maximum output power if the choke inductor in the amplifier is used. Therefore, a need to improve the amplifier performance of piezoelectric transducers exists for mobile ultrasound applications. In this study, a post-voltage-boost circuit-supported class-B amplifier used for mobile ultrasound applications was developed to increase the acoustic performance of piezoelectric transducers. The measured voltage of the post-voltage-boost circuit-supported class-B amplifier (62 VP-P) is higher than that of only a class-B amplifier (50 VP-P) at 15 MHz and 100 mVP-P input. By performing the pulse-echo measurement test, the echo signal with the post-voltage-boost circuit-supported class-B amplifier (10.39 mVP-P) was also noted to be higher than that with only a class-B amplifier (6.15 mVP-P). Therefore, this designed post-voltage-boost circuit can help improve the acoustic amplitude of piezoelectric transducers used for mobile ultrasound applications.

show abstract

“…Research has begun in the area of ultrasound capsule endoscopy (USCE) [4], [5] at ultrasound frequencies suitable for imaging beyond the GI tract, mimicking conventional EUS. Work has also been done on μUSCE, both in systems design [6] and experimental demonstrations [7]. However, examination of the signal quality offered by direct or fluid-mediated ultrasonic coupling between tissue and the capsule has been limited.…”

Section: In-vivo Evaluation Of Microultrasound and Thermometric Capsumentioning

confidence: 99%

In-Vivo Evaluation of Microultrasound and Thermometric Capsule Endoscopes

Lay

Cummins

Cox

et al. 2019

IEEE Trans. Biomed. Eng.

Self Cite

View full text Add to dashboard Cite

Clinical endoscopy and colonoscopy are commonly used to investigate and diagnose disorders in the upper gastrointestinal tract and colon respectively. However, examination of the anatomically remote small bowel with conventional endoscopy is challenging. This and advances in miniaturization led to the development of video capsule endoscopy (VCE) to allow small bowel examination in a non-invasive manner. Available since 2001, current capsule endoscopes are limited to viewing the mucosal surface only due to their reliance on optical imaging. To overcome this limitation with submucosal imaging, work is under way to implement microultrasound (μUS) imaging in the same form as VCE devices. This paper describes two prototype capsules, termed Sonocap and Thermocap, which were developed respectively to assess the quality of μUS imaging and the maximum power consumption that can be tolerated for such a system. The capsules were tested in vivo in the oesophagus and small bowel of porcine models. Results are presented in the form of μUS B-scans and safe temperature readings observed up to 100 mW in both biological regions. These results demonstrate that acoustic coupling and μUS imaging can be achieved in vivo in the lumen of the bowel and the maximum power consumption that is possible for miniature μUS systems.

show abstract

Development of a Mechanical Scanning Device With High-Frequency Ultrasound Transducer for Ultrasonic Capsule Endoscopy

Cited by 45 publications

References 37 publications

Design and Simulation of a Ring-Shaped Linear Array for Microultrasound Capsule Endoscopy

Design and Simulation of a Ring-Shaped Linear Array for Microultrasound Capsule Endoscopy

Post-Voltage-Boost Circuit-Supported Single-Ended Class-B Amplifier for Piezoelectric Transducer Applications

In-Vivo Evaluation of Microultrasound and Thermometric Capsule Endoscopes

Contact Info

Product

Resources

About