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Abstract
An active needle is proposed for the development of magnetic resonance imaging (MRI)-guided percutaneous procedures. The needle uses a low-transition-temperature shape memory alloy (LT SMA) wire actuator to produce bending in the distal section of the needle. Actuation is achieved with internal optical heating using laser light transported via optical fibers and side coupled to the LT SMA. A prototype, with a size equivalent to a standard 16-gauge biopsy needle, exhibits significant bending, with a tip deflection of more than 14° in air and 5° in hard tissue. A single-ended optical sensor with a gold-coated tip is developed to measure the curvature independently of temperature. The experimental results in tissue phantoms show that human tissue causes fast heat dissipation from the wire actuator; however, the active needle can compensate for typical targeting errors during prostate biopsy.
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Affiliation(s)
| | | | - Je-Sung Koh
- Biorobotics Laboratory, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742,Korea
| | - Pierre Renaud
- ICube Strasbourg University, CNRS, INSA, 67084 Strasbourg France
| | - Richard J. Black
- Intelligent Fiber Optic Systems Corporation, Santa Clara, CA 95054 USA
| | - Behzad Moslehi
- Intelligent Fiber Optic Systems Corporation, Santa Clara, CA 95054 USA
| | - Bruce L. Daniel
- Department of Radiology, Stanford University, Stanford, CA 94305 USA
| | - Kyu-Jin Cho
- Biorobotics Laboratory, School of Mechanical and Aerospace Engineering/IAMD, Seoul National University, Seoul 151-742, Korea
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Elayaperumal S, Bae JH, Christensen D, Cutkosky MR, Daniel BL, Costa JM, Black RJ, Faridian F, Moslehi B. MR-compatible biopsy needle with enhanced tip force sensing. Joint Eurohaptics Conf Symp Haptic Interfaces Virtual Environ Teleoper Syst 2013; 2013:109-114. [PMID: 26509189 DOI: 10.1109/whc.2013.6548393] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We describe an instrumented biopsy needle that provides physicians the capability to sense interaction forces directly at the tip of the needle's inner stylet. The sensors consist of optical fiber Bragg gratings (FBGs), and are unaffected by electromagnetic fields; hence the needle is suitable for MR-guided procedures. In comparison to previous instrumented needles that measure bending strains, the new design has additional sensors and a series of micro-machined holes at the tip. The holes increase strain sensitivity, especially to axial forces, without significantly reducing the stiffness or strength. A comparison of the dynamic forces measured with the new needle and those obtained using a force/torque sensor at the needle base shows that the enhanced tip sensitivity is particularly noticeable when there is significant friction along the needle sleeve.
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Park YL, Elayaperumal S, Daniel B, Ryu SC, Shin M, Savall J, Black RJ, Moslehi B, Cutkosky MR. Real-Time Estimation of 3-D Needle Shape and Deflection for MRI-Guided Interventions. IEEE ASME Trans Mechatron 2010; 15:906-915. [PMID: 26405428 PMCID: PMC4577522 DOI: 10.1109/tmech.2010.2080360] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We describe a MRI-compatible biopsy needle instrumented with optical fiber Bragg gratings for measuring bending deflections of the needle as it is inserted into tissues. During procedures, such as diagnostic biopsies and localized treatments, it is useful to track any tool deviation from the planned trajectory to minimize positioning errors and procedural complications. The goal is to display tool deflections in real time, with greater bandwidth and accuracy than when viewing the tool in MR images. A standard 18 ga × 15 cm inner needle is prepared using a fixture, and 350-μm-deep grooves are created along its length. Optical fibers are embedded in the grooves. Two sets of sensors, located at different points along the needle, provide an estimate of the bent profile, as well as temperature compensation. Tests of the needle in a water bath showed that it produced no adverse imaging artifacts when used with the MR scanner.
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Affiliation(s)
- Yong-Lae Park
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Santhi Elayaperumal
- Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Bruce Daniel
- Department of Radiology, Stanford University, Stanford, CA 94305, USA
| | - Seok Chang Ryu
- Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Mihye Shin
- Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Joan Savall
- Howard Hughes Medical Institute, Chevy Chase, MD 20815 USA, and also with the Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Richard J. Black
- Intelligent Fiber Optic Systems (IFOS) Corporation, Santa Clara, CA 95054, USA
| | - Behzad Moslehi
- Intelligent Fiber Optic Systems (IFOS) Corporation, Santa Clara, CA 95054, USA
| | - Mark R. Cutkosky
- Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
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Yong-Lae Park, Seok Chang Ryu, Black R, Chau K, Moslehi B, Cutkosky M. Exoskeletal Force-Sensing End-Effectors With Embedded Optical Fiber-Bragg-Grating Sensors. IEEE T ROBOT 2009. [DOI: 10.1109/tro.2009.2032965] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Moslehi B, Ng J, Kasimoff I, Jannson T. Fiber-optic coupling based on nonimaging expanded-beam optics. Opt Lett 1989; 14:1327-1329. [PMID: 19759673 DOI: 10.1364/ol.14.001327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have fabricated and experimentally tested low-cost and mass-producible multimode fiber-optic couplers and connectors based on nonimaging beam-expanding optics and Liouville's theorem. Analysis indicates that a pair coupling loss of -0.25 dB can be achieved. Experimentally, we measured insertion losses as low as -0.38 dB. The beam expanders can be mass produced owing to the use of plastic injection-molding fabrication techniques and packaged in standard connector housings. This design is compatible with the fiber geometry and can yield highly stable coupling owing to its high tolerance for misalignments.
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Moslehi B, Harvey P, Ng J, Jannson T. Fiber-optic wavelength-division multiplexing and demultiplexing using volume holographic gratings. Opt Lett 1989; 14:1088-1090. [PMID: 19753065 DOI: 10.1364/ol.14.001088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present theoretical and experimental results of a novel fiber-optic wavelength-division multiplexing (WDM) design employing a broadband (>150-nm) dichromated gelatin volume holographic grating operating in a reflective Littrow configuration with on-axis optics, a single lens, and one fiber array. This configuration can achieve better than -1.5-dB insertion loss and -40-dB cross talk for a 6-channel system and -2.5-dB insertion loss and -20-dB cross talk for a 12-channel system with 15-nm channel spacing. For an experimental 4-channel WDM unit we measured better than -1.5-dB insertion loss for all channels and less than -32-dB cross talk. This design can provide cost and performance benefits for local area network communication applications.
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Moslehi B, Goodman JW, Rawson EG. Bandwidth estimation for multimode optical fibers using the frequency correlation function of speckle patterns. Appl Opt 1983; 22:995-999. [PMID: 18195912 DOI: 10.1364/ao.22.000995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this paper we present a new method for estimating the bandwidth of multimode optical fibers based on the frequency correlation function of the speckle patterns generated by the interference of fiber modes. This technique, which does not require a pulse or signal generator, can be utilized to estimate the bandwidth of a multimode fiber using a relatively short length of fiber. By applying this method to a test fiber we obtained a bandwidth of approximately 36 MHz km which is in relatively good agreement with the approximately 44-MHz x km bandwidth measured by a conventional pulsed technique.
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Affiliation(s)
- B Moslehi
- Stanford University, Department of Electrical Engineering, Stanford, California 94305, USA
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Abstract
The power spectrum of the optical intensity at the output of a single-mode-fiber recirculating delay line driven by a multimode semiconductor laser is shown to exhibit a spectral structure with notches at zero frequency as well as at other multiples of 1/(loop delay). A theoretical model based on laser phase noise is suggested to explain the experimental data.
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Tur M, Goodman JW, Moslehi B, Bowers JE, Shaw HJ. Fiber-optic signal processor with applications to matrix-vector multiplication and lattice filtering. Opt Lett 1982; 7:463-465. [PMID: 19714057 DOI: 10.1364/ol.7.000463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new fiber-optic signal processor is proposed to implement systolic matrix-vector multipliers and lattice filters. 10(9) multiplications/sec can be achieved with currently available components for matrix-vector multiplications that involve Toeplitz matrices. A 2 x 2 (Toeplitz) matrix-vector multiplier has been experimentally demonstrated using single-mode fibers and directional couplers. The filtering characteristics of the device are also discussed.
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