Wireless oscillating device for power Doppler-based interstitial needle tip identification

Orlando, Nathan; Snir, Jonatan; Barker, Kevin; Hoover, Douglas A.; Fenster, Aaron

doi:10.1117/12.2581103

Cited by 3 publications

(5 citation statements)

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“…Real‐time ultrasound Doppler imaging was used to visualize the lead in the superior vena cava and the right atrium. In addition to the piezoelectric buzzers, advanced needle excitation devices, such as the device introduced by Orlando et al., 52 can be used to generate needle Doppler responses with frequencies that are different from the Doppler frequencies induced by body organs.…”

Section: Discussionmentioning

confidence: 99%

Needle detection using ultrasound B‐mode and power Doppler analyses

et al. 2022

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Background: Ultrasound is employed in needle interventions to visualize the anatomical structures and track the needle. Nevertheless, needle detection in ultrasound images is a difficult task, specifically at steep insertion angles. Purpose: A new method is presented to enable effective needle detection using ultrasound B-mode and power Doppler analyses. Methods: A small buzzer is used to excite the needle and an ultrasound system is utilized to acquire B-mode and power Doppler images for the needle. The B-mode and power Doppler images are processed using Radon transform and local-phase analysis to initially detect the axis of the needle. The detection of the needle axis is improved by processing the power Doppler image using alpha shape analysis to define a region of interest (ROI) that contains the needle. Also, a set of feature maps is extracted from the ROI in the B-mode image. The feature maps are processed using a machine learning classifier to construct a likelihood image that visualizes the posterior needle likelihoods of the pixels. Radon transform is applied to the likelihood image to achieve an improved needle axis detection. Additionally, the region in the B-mode image surrounding the needle axis is analyzed to identify the needle tip using a custom-made probabilistic approach. Our method was utilized to detect needles inserted in ex vivo animal tissues at shallow [20 • − 40 • ), moderate [40 • − 60 • ), and steep [60 • − 85 • ] angles.Results: Our method detected the needles with failure rates equal to 0% and mean angle, axis, and tip errors less than or equal to 0.7 • , 0.6 mm, and 0.7 mm, respectively. Additionally, our method achieved favorable results compared to two recently introduced needle detection methods. Conclusions:The results indicate the potential of applying our method to achieve effective needle detection in ultrasound images.

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Section: Discussionmentioning

confidence: 99%

Needle detection using ultrasound B‐mode and power Doppler analyses

et al. 2022

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“…Mechanical oscillators have previously been used to vibrate the end of a needle. 21,22 Orlando et al developed a handheld wireless oscillator to vibrate a single needle, which improved tip visualization in power Doppler mode. The study focused on tip accuracy, and the authors noted that the power Doppler signal extended into the surrounding tissue and along the comet tail US artifact, which suggested an opportunity to optimize the system for improved selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Mechanical oscillators have previously been used to vibrate the end of a needle 21,22 . Orlando et al developed a handheld wireless oscillator to vibrate a single needle, which improved tip visualization in power Doppler mode.…”

Section: Introductionmentioning

confidence: 99%

Color VISION for improved ultrasound visualization of brachytherapy needles

Dupere,

Brost,

Hainy

et al. 2024

Medical Physics

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BackgroundHigh dose rate brachytherapy is commonly used in the treatment of prostate cancer. Treatment planning is often performed under transrectal ultrasound (US) guidance, but brachytherapy needles can be challenging to digitize due to the presence of poor US conspicuity and imaging artifacts. The plan accuracy and quality, however, are dependent on the proper visualization of the needles with millimeter accuracy.PurposeThis work describes a technique for generating a color overlay of needle locations atop the grayscale US image. Prototype devices were developed to produce vibrations in the brachytherapy needles that generate a high contrast color Doppler (CD) signal that highlights the needle locations with superior contrast and reduced artifacts. Denoted by the acronym color VISION (Vibrationally Induced Shimmering for Identifying an Object's Nature), the technology has the potential to improve applicator conspicuity and facilitate automated applicator digitization.MethodsThree prototype vibrational devices with frequencies between 200–450 Hz were designed in‐house and evaluated with needle implants in a phantom and cadaveric male pelvis using: (1) an actuator attached to the front of a prostate needle template; (2) an actuator attached to the top of the needle template; and (3) a hand‐held actuator with a stylet, inserted directly into a needle's inner lumen. Acquired images were postprocessed in MATLAB to evaluate the potential for automated digitization.ResultsAll prototype devices produced localized shimmering in implanted brachytherapy needles in both the axial and sagittal planes. The template mounted actuators provided better vibrational coupling and ease of operation than the stylet prototype. The Michelson contrast, or visibility, of the shimmering CD signal was 100% compared with ≤40% for B‐mode imaging of a single needle. Proof‐of‐principle for automated applicator digitization using only the CD signal was demonstrated.ConclusionsThe color VISION prototype devices successfully coupled mechanical vibrations into brachytherapy needles to generate US CD shimmering and accurately highlight brachytherapy needle locations. The high contrast and natively registered signal are promising for future work to automate the needle digitization and provide a real‐time visual overlay of the applicator on the B‐mode US image.

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“…To overcome these limitations and improve clinical translation potential, we presented the initial feasibility design of a wireless mechanical oscillator designed specifically for BT, tested in a small-scale proof -of -concept phantom study with six needles. 23 In this paper, we report on the development and validation of our clinically-ready novel wireless mechanical oscillator and PD US needle tip localization method through comprehensive tissue-equivalent phantom experiments simulating prostate HDR-BT procedures and scenarios with extensive shadowing artifacts limiting needle visibility. In addition, we validated our PD US method in five prostate cancer patients undergoing standard HDR-BT as part of a prospective feasibility clinical trial, the first of its kind to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

“…The additional computer and required cables were cumbersome in the busy operating room environment. To overcome these limitations and improve clinical translation potential, we presented the initial feasibility design of a wireless mechanical oscillator designed specifically for BT, tested in a small‐scale proof‐of‐concept phantom study with six needles 23 …”

Section: Introductionmentioning

confidence: 99%

A power Doppler ultrasound method for improving intraoperative tip localization for visually obstructed needles in interstitial prostate brachytherapy

et al. 2023

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High-dose-rate (HDR) interstitial brachytherapy (BT) is a common treatment technique for localized intermediate to high-risk prostate cancer. Transrectal ultrasound (US) imaging is typically used for guiding needle insertion, including localization of the needle tip which is critical for treatment planning. However, image artifacts can limit needle tip visibility in standard brightness (B)mode US, potentially leading to dose delivery that deviates from the planned dose. To improve intraoperative tip visualization in visually obstructed needles, we propose a power Doppler (PD) US method which utilizes a novel wireless mechanical oscillator, validated in phantom experiments and clinical HDR-BT cases as part of a feasibility clinical trial. Methods: Our wireless oscillator contains a DC motor housed in a 3D printed case and is powered by rechargeable battery allowing the device to be operated by one person with no additional equipment required in the operating room. The oscillator end-piece features a cylindrical shape designed for BT applications to fit on top of the commonly used cylindrical needle mandrins. Phantom validation was completed using tissue-equivalent agar phantoms with the clinical US system and both plastic and metal needles. Our PD method was tested using a needle implant pattern matching a standard HDR-BT procedure as well as an implant pattern designed to maximize needle shadowing artifacts. Needle tip localization accuracy was assessed using the clinical method based on ideal reference needles as well as a comparison to computed tomography (CT) as a gold standard. Clinical validation was completed in five patients who underwent standard HDR-BT as part of a feasibility clinical trial. Needle tips positions were identified using B-mode US and PD US with perturbation from our wireless oscillator. Results: Absolute mean ± standard deviation tip error for B-mode alone, PD alone, and B-mode combined with PD was respectively: 0.3 ± 0.3 mm, 0.6 ± 0.5 mm, and 0.4 ± 0.2 mm for the mock HDR-BT needle implant; 0.8 ± 1.7 mm, 0.4 ± 0.6 mm, and 0.3 ± 0.5 mm for the explicit shadowing implant with plastic needles; and 0.5 ± 0.2 mm, 0.5 ± 0.3 mm, and 0.6 ± 0.2 mm for the explicit shadowing implant with metal needles. The total mean absolute tip error for all five patients in the feasibility clinical trial was 0.9 ± 0.7 mm using Bmode US alone and 0.8 ± 0.5 mm when including PD US, with increased benefit observed for needles classified as visually obstructed.

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Wireless oscillating device for power Doppler-based interstitial needle tip identification

Cited by 3 publications

References 0 publications

Needle detection using ultrasound B‐mode and power Doppler analyses

Needle detection using ultrasound B‐mode and power Doppler analyses

Color VISION for improved ultrasound visualization of brachytherapy needles

A power Doppler ultrasound method for improving intraoperative tip localization for visually obstructed needles in interstitial prostate brachytherapy

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