A light-guidance system to be used for CT-guided biopsy.

Frederick, Philip R.; Brown, Tiffany; Miller, Merle; Bahr, A L; Taylor, Kristina

doi:10.1148/radiology.154.2.3966142

Cited by 30 publications

(20 citation statements)

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“…Frederick et al [5] reported on a system that utilized planes of intersecting light to guide needle passage, and demonstrated an accuracy of ±1 mm and ±1°. Mechanical stereotactic devices have also been employed with good accuracy, resulting in a 75% decrease in needle manipulations in one study [6].…”

Section: Discussionmentioning

confidence: 99%

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Laser Navigation for Radiofrequency Ablation

Varro

Locklin

Wood

2004

CVIR

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A 45-year-old male with renal cell carcinoma secondary to von-Hippel Lindau (VHL) disease presented for radiofrequency ablation (RFA) of kidney tumors. Due to his prior history of several partial nephrectomies and limited renal reserve, RFA was chosen because of its relatively nephronsparing nature. A laser guidance device was used to help guide probe placement in an attempt to reduce procedure time and improve targeting accuracy. The device was successful at guiding needle placement, as both tumors were located with a single pass. Follow-up CT scan confirmed accurate needle placement, showing an area of coagulation necrosis covering the previously seen tumor. KeywordsRadiofrequency ablation; Laser guidance; Renal cell carcinoma; von-Hippel Lindau disease Navigation and guidance devices for CT-guided interventions have been relatively underutilized, however, they show promise for effectively and accurately assisting needle or probe placement. Multiple systems and techniques have been developed to assist CT-guided procedures [5][6][7][8][9], varying from the complex (robotics) [1], to the simple fluid-filled disk, to approximate planned needle angulations [2].Radiofrequency ablation (RFA) is becoming broadly available in the oncology community, and is being studied for kidney tumors with some degree of success. We have performed nearly 200 kidney tumor ablations, and we often rely upon nearby landmarks for accurate needle angle selection to treat radiographically occult tumors. Laser guidance was used to assist in RFA in a kidney tumor that was difficult to visualize by CT scan without contrast. Local ablative therapies rely upon extreme accuracy for successful outcomes. The device (SimpliCT, NeoRad AS, Norway) is free standing, portable, and independent of the CT gantry. It consists of a laser source mounted on an L-shaped track, which stands on a 3-wheel lockable base (Fig. 1). Laser guidance simplified radiofrequency probe angulation implementation, and also facilitated probe repositioning for a second burn, according to a treatment plan developed with pretreatment CT. The authors have no commercial interest in the device. Case ReportA 45-year-old male with a history of von Hippel-Lindau disease presented for radiofrequency ablation of 2 left-sided kidney tumors. VHL is an autosomal dominant disorder, characterized by the development of both benign and malignant tumors [3]. This patient had bilateral renal cell carcinoma, and had undergone a left partial nephrectomy in 1995, and a right partial nephrectomy in 1999. During a follow-up hospitalization in 2000, he was found to have regrowth of tumor in both kidneys. Percutaneous RFA of the left-sided lesions was attempted at that time, but the procedure was aborted secondary to inadequate visualization of the tumors.

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Section: Discussionmentioning

confidence: 99%

“…Multiple systems and techniques have been developed to assist CT-guided procedures [5][6][7][8][9], varying from the complex (robotics) [1], to the simple fluid-filled disk, to approximate planned needle angulations [2].…”

Section: Introductionmentioning

confidence: 99%

Laser Navigation for Radiofrequency Ablation

Varro

Locklin

Wood

2004

CVIR

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“…The light localizer has previously been used in CT-guided biopsy procedures [4]. To our knowledge, the shadow cast by the hub of the needle over the point of entrance of the needle has not been used to correct the guidance of the needle as a substitute for fluoroscopy in fluoroscopically guided procedures.…”

Section: Discussionmentioning

confidence: 99%

Use of light localizer in fluoroscopically guided percutaneous procedures

Db¹

1987

American Journal of Roentgenology

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The use ofthe radiographic-fluoroscopic-tubelight localizer in conjunction with fluoroscopically guided percutaneous procedures can reduce the amount of fluoroscopy time necessary. When the needle hub shadow is projected directly over the point of entrance of the needle into the skin, the fluoroscopic central ray, the needle, and the structure to be punctured (previously centered fluoroscopically) are all coaxial, and the needle can be advanced with the light localizer substituting for much of the fluoroscopy.This technique is applicable for all equipment in which the fluoroscopic X-ray tube, equipped with a light localizer, is used.

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“…Laser guidance devices are also used to help guide probe placement in order to reduce procedure time and improve targeting accuracy [6]. Newer CT scanners, however, are often unable to tilt the gantry because of size and engineering challenges [7]. Consequently, there is a developing need for an alternative method of performing the double angled biopsies under CTguidance.…”

Section: Introductionmentioning

confidence: 99%

Infrared camera imaging algorithm to augment CT-assisted biopsy procedures

Leis

Sharifi

2012

2012 6th International Conference on Signal Processing and Communication Systems

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Abstract-The problem with CT guided biopsies is the high dosage of radiation exposure to the patient, the time it takes to perform the procedure and the lack of spatial reference of the operator. We approach this problem by using a system comprising of two digital infrared sensitive cameras and a high intensity infrared illuminator which was used to capture the coordinates of an infrared reflective tape attached to a coaxial biopsy needle having been inserted into a test phantom. Data was sent in real-time to a computer where the infrared needle position coordinates were recorded. A CT scan of the test phantom was then taken and the DICOM CT image coordinates of the needle were also recorded. The approach is to use a linear least-squares model to map points from each camera to a single point on each DICOM CT image resulting from the CT scan. Results show a promising mapping accuracy with limited data. The contribution of this paper is to show that a passive infrared imaging system using at least two cameras may be suitable for the needle estimation task in two dimensions which would allow real-time needle placement in any plane.

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A light-guidance system to be used for CT-guided biopsy.

Cited by 30 publications

References 0 publications

Laser Navigation for Radiofrequency Ablation

Laser Navigation for Radiofrequency Ablation

Use of light localizer in fluoroscopically guided percutaneous procedures

Infrared camera imaging algorithm to augment CT-assisted biopsy procedures

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