Side-viewing photoacoustic waveguide endoscopy

Miranda, Christopher; Marschall, Ethan; Browning, Blake; Smith, Barbara

doi:10.1016/j.pacs.2020.100167

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…One of the challenging aspects of designing PAE systems is miniaturization of transducers. Hence, in another work, a side-viewing PA waveguide endoscope (Miranda et al, 2020) was reported which did not require the transducer to be encapsulated within the endoscope's body and eliminated the need for miniaturized transducers. The light exiting the fibre optic for irradiation was externally coupled to a perpendicularly positioned and submerged transducer for acquiring PA images.…”

Section: Photoacoustic Endoscopymentioning

confidence: 99%

Another decade of photoacoustic imaging

et al. 2021

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Photoacoustic imaging—a hybrid biomedical imaging modality finding its way to clinical practices. Although the photoacoustic phenomenon was known more than a century back, only in the last two decades it has been widely researched and used for biomedical imaging applications. In this review we focus on the development and progress of the technology in the last decade (2011–2020). From becoming more and more user friendly, cheaper in cost, portable in size, photoacoustic imaging promises a wide range of applications, if translated to clinic. The growth of photoacoustic community is steady, and with several new directions researchers are exploring, it is inevitable that photoacoustic imaging will one day establish itself as a regular imaging system in the clinical practices.

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Section: Photoacoustic Endoscopymentioning

confidence: 99%

Another decade of photoacoustic imaging

et al. 2021

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“…Maintaining the endoscope close to the target with an angle of less than 20° under in vivo imaging conditions requires a high-level endoscopic skill. One solution is to utilize a side-viewing endoscope to observe a luminal organ 23 , 24 , which helps control the distance between the endoscope and tissue and imaging angles. However, it also requires high-level skills of the endoscopist.…”

Section: Discussionmentioning

confidence: 99%

Assessment of angle-dependent spectral distortion to develop accurate hyperspectral endoscopy

Lee

Yoon

2022

Sci Rep

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Hyperspectral endoscopy has shown its potential to improve disease diagnosis in gastrointestinal tracts. Recent approaches in developing hyperspectral endoscopy are mainly focusing on enhancing image speed and quality of spectral information under a clinical environment, but there are many issues in obtaining consistent spectral information due to complicated imaging conditions, including imaging angle, non-uniform illumination, working distance, and low reflected signal. We quantitatively investigated the effect of imaging angle on the distortion of spectral information by exploiting a bifurcated fiber, spectrometer, and tissue-mimicking phantom. Spectral distortion becomes severe as increasing the angle of the imaging fiber or shortening camera exposure time for fast image acquisition. Moreover, spectral ranges from 450 to 550 nm are more susceptible to the angle-dependent spectral distortion than longer spectral ranges. Therefore, imaging angles close to normal and longer target spectral ranges with enough detector exposure time could minimize spectral distortion in hyperspectral endoscopy. These findings will help implement clinical HSI endoscopy for the robust and accurate measurement of spectral information from patients in vivo.

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“…Target size varied widely (

to 1 mm) due to the broad range of minimum size requirements for PAI devices with different resolution limits. Line target materials included metal wires or filaments (tungsten, steel, copper, aluminum, or unspecified metal), 48 , 60 , 67 , 78 , 79 , 93 – 99 carbon fibers, 100 – 103 threads, 51 , 104 , 105 sutures, 48 , 89 , 106 – 108 graphite rods (pencil lead), 50 , 109 , 110 or human/horse hairs. 10 , 86 , 111 – 118 Some studies imaged inkjet-printed target patterns on paper or transparency film suspended in water or a tissue-mimicking medium.…”

Section: Current Image Quality Evaluation Practices In Photoacoustic Imagingmentioning

confidence: 99%

Review of consensus test methods in medical imaging and current practices in photoacoustic image quality assessment

et al. 2021

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. Significance : Photoacoustic imaging (PAI) is a powerful emerging technology with broad clinical applications, but consensus test methods are needed to standardize performance evaluation and accelerate translation. Aim : To review consensus image quality test methods for mature imaging modalities [ultrasound, magnetic resonance imaging (MRI), x-ray CT, and x-ray mammography], identify best practices in phantom design and testing procedures, and compare against current practices in PAI phantom testing. Approach : We reviewed scientific papers, international standards, clinical accreditation guidelines, and professional society recommendations describing medical image quality test methods. Observations are organized by image quality characteristics (IQCs), including spatial resolution, geometric accuracy, imaging depth, uniformity, sensitivity, low-contrast detectability, and artifacts. Results : Consensus documents typically prescribed phantom geometry and material property requirements, as well as specific data acquisition and analysis protocols to optimize test consistency and reproducibility. While these documents considered a wide array of IQCs, reported PAI phantom testing focused heavily on in-plane resolution, depth of visualization, and sensitivity. Understudied IQCs that merit further consideration include out-of-plane resolution, geometric accuracy, uniformity, low-contrast detectability, and co-registration accuracy. Conclusions : Available medical image quality standards provide a blueprint for establishing consensus best practices for photoacoustic image quality assessment and thus hastening PAI technology advancement, translation, and clinical adoption.

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Side-viewing photoacoustic waveguide endoscopy

Cited by 12 publications

References 28 publications

Another decade of photoacoustic imaging

Another decade of photoacoustic imaging

Assessment of angle-dependent spectral distortion to develop accurate hyperspectral endoscopy

Review of consensus test methods in medical imaging and current practices in photoacoustic image quality assessment

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