External Referencing Systems

Newman, Robert W.; Penner, Eduard

doi:10.1007/978-3-642-60272-6_10

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Accurate placement of the needles was ensured using a flashpoint-tracking device (Image Guided Technologies, Boulder, CO). This consists of a handpiece, with integral infrared light-emitting diodes (13), whose exact position is monitored by three infrared-sensitive cameras mounted on the magnet gantry. The scanner software is able to localize the handpiece in three dimensions and sets scan planes as determined, according to handpiece needle orientation.…”

Section: Methodsmentioning

confidence: 99%

Magnetic resonance-guided percutaneous laser ablation of uterine fibroids

Law

Gedroyc

Regan

2000

J. Magn. Reson. Imaging

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Section: Methodsmentioning

confidence: 99%

Magnetic resonance-guided percutaneous laser ablation of uterine fibroids

Law

Gedroyc

Regan

2000

J. Magn. Reson. Imaging

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“…Infrared light-emittingdiodes are affixed to the instrument outside the body [48]. Infrared light-emittingdiodes are affixed to the instrument outside the body [48].…”

Section: Abbildungen 2a Und 2bmentioning

confidence: 99%

Interventional and Intravascular MR Angiography

Ladd

Debatin

2000

Herz

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Magnetic resonance imaging (MRI) has a number of characteristics which make it attractive for guidance of intravascular therapeutic procedures, including high soft tissue contrast, imaging in any arbitrary oblique plane, lack of ionizing radiation, and the ability to provide functional information, such as flow velocity and volume per unit time. For MR guidance of vascular interventions to be safe, catheters and guidewires must be visualized relative to the vascular system and surrounding tissues. A number of approaches for making instruments visible in an MR environment are presented, including both passive and active techniques. Passive techniques depend on contrast agents or susceptibility artifacts, whereas active techniques, including MR tracking, MR profiling, and active field inhomogeneity, use some form of electrical coil built into the instrument. The potential for obtaining high-resolution images of the vessel wall using coils built into a catheter is also discussed. These images provide the capability to distinguish and identify various plaque components. The additional capabilities of MRI could potentially open up new applications beyond those currently performed under X-ray fluoroscopic guidance.

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“…One technique uses a hand piece with infrared light-emitting diodes (LEDs) to triangulate the object position and overlays the predicted trajectory onto the MR image. 16,20,21 One particular implementation (Flashpoint [Image Guided Technologies; Boulder, Colorado]) consists of three infrared cameras mounted in the gantry of the scanner (Fig. 3A).…”

Section: Optical Triangulationmentioning

confidence: 99%

“…3A). 16,20 The biopsy needle is inserted into a hand piece on which two or three LEDs are mounted. By triangulating the position of the LEDs, the position and orientation of the hand piece can be determined.…”

Section: Optical Triangulationmentioning

confidence: 99%

“…In the case of optical triangulation, a properly calibrated system can achieve an accuracy of ±2 mm. 20 An underlying assumption is that the biopsy needle is not bent from its expected path, an assumption that is often violated in practice. Nevertheless, the optical triangulation systems provide an adequate check because an image can be acquired along the expected needle path.…”

Section: Safetymentioning

confidence: 99%

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Instrument Visualization in a Magnetic Resonance Imaging Environment

Ladd¹,

Debatin²

1999

Semin intervent Radiol

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Magnetic resonance (MR) imaging has a number of characteristics that make it attractive for interventional guidance, including superior soft tissue contrast; the lack of ionizing radiation; the ability to provide functional information such as flow, perfusion, and diffusion; and the ability to monitor tissue temperature during ablation therapy. To date, MR scanning has played only a minor role in interventional guidance. One hindrance is that current interventional instruments are poorly visualized in an MR image. This article presents a number of approaches to making instruments visible in an MR scanning environment. Passive techniques, using signal voids, contrast agents, or susceptibility artifacts, as well as active alternatives, including optical triangulation, MR tracking, MR profiling, and active field inhomogeneity, are discussed.

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External Referencing Systems

Cited by 5 publications

References 7 publications

Magnetic resonance-guided percutaneous laser ablation of uterine fibroids

Magnetic resonance-guided percutaneous laser ablation of uterine fibroids

Interventional and Intravascular MR Angiography

Instrument Visualization in a Magnetic Resonance Imaging Environment

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