Interactive three-point localization of double-oblique sections using MR fluoroscopy

Debbins, Josef P.; Kruger, David G.; Fain, Sean B.; Riederer, Stephen J.

doi:10.1002/(sici)1522-2594(199904)41:4<846::aid-mrm26>3.0.co;2-l

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…[2]). The upper and lower asymptotes prevent image acquisition parameters from being set in ranges that would cause the pulse sequence to exceed hardware limitations.…”

Section: Adaptive Image Parametersmentioning

confidence: 99%

Real‐time catheter tracking and adaptive imaging

Elgort

Wong

Hillenbrand

et al. 2003

Magnetic Resonance Imaging

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Purpose:To evaluate the performance of a real-time MR system for interventional procedures that adjusts specific image parameters in real time based on a catheter's speed of insertion. Materials and Methods:The system was implemented using only the hardware provided with a standard short-bore 1.5 T scanner (Siemens Magnetom Sonata) (with the exception of small tracking markers affixed to the catheter). The system tracks the position of an MR microcoil-instrumented catheter and automatically updates the scan plane's position and orientation, as well as other features, including, but not limited to, field of view, resolution, tip angle, and TE. A realtime feedback loop continuously localizes the tracking markers, updates the scan plane position and orientation, calculates the catheter's speed, adjusts the value of specific image parameters, then collects new image data, reconstructs an image, and provides it for immediate display. The system was evaluated in phantom and in vivo porcine experiments. Results:The system is able to accurately localize a moving catheter in the abdominal aorta, calculate the device speed, and respond by adjusting specified image parameters 98% of the time, with precision of approximately 2 mm and 1.5°. Conclusion:Simply slowing the speed of the catheter allows the clinician to adjust predetermined image parameters. This work also has the potential to build a degree of intelligence into the scanner, enabling it to react to changes in the clinical environment and automatically optimize specific image parameters.

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“…[2]). The upper and lower asymptotes prevent image acquisition parameters from being set in ranges that would cause the pulse sequence to exceed hardware limitations.…”

Section: Adaptive Image Parametersmentioning

confidence: 99%

Real‐time catheter tracking and adaptive imaging

Elgort

Wong

Hillenbrand

et al. 2003

Magnetic Resonance Imaging

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“…A variety of tools were used for interactive maneuvering of the fluoroscopic plane of section. Particularly useful was a three-point tool (17) that allowed the operator to identify three arbitrary points within the volume of interest, which were then used immediately to define the plane that intersected all three points as the imaging section. During the actual fluoroscopically triggered study, the delay after operator issuance of the command to trigger the 3D sequence and actual initiation of the sequence (defined in the Appendix as the ''system trigger latency'') is approximately three repetition time intervals, or less than 30 msec.…”

Section: Mr Fluoroscopic and 3d Mr Angiographic Pulse Sequencesmentioning

confidence: 99%

“…(a-f ) Nearly sagittal oblique real-time fluoroscopic images with the time after contrast material injection indicated. The cursors (ϩ) indicate points in axial-format fluoroscopic images identified by the operator in selecting the oblique section shown by using the interactive three-point localization tool(17). At the time of injection, the flip angle of the fluoroscopic sequence was automatically increased from 12°to 30°to be better matched to the short T1 of the contrast-enhanced blood.…”

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confidence: 99%

Three-dimensional Contrast-enhanced MR Angiography with Real-time Fluoroscopic Triggering: Design Specifications and Technical Reliability in 330 Patient Studies

Bernstein²,

et al. 2000

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Technical reliability was determined for triggering three-dimensional (3D) contrast material-enhanced magnetic resonance (MR) angiography with MR fluoroscopy. Technical requirements for high reliability were also identified. Reliability was evaluated in 330 consecutive patient studies of the neck, thorax, abdomen, and pelvis. Contrast material arrival was detected fluoroscopically in 325 of the 330 studies (98.5%), and the 3D sequence was successfully triggered in 321 of 330 studies (97.3%). Fluoroscopic triggering of centrically encoded 3D MR angiographic acquisitions is a highly reliable means of obtaining 3D MR angiograms with high spatial resolution.

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“…Graphic tools for automatically adjusting the scan plane to efficiently localize structures are used as described in Ref. 27.…”

Section: Interactive Pulse Sequence Controlmentioning

confidence: 99%

Interactive fast spin-echo imaging

et al. 2000

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It is shown that a spin‐echo sequence may be used to acquire T2‐weighted, high‐resolution, high‐SNR sections at quasi‐real‐time frame rates for interactive, diagnostic imaging. A single‐shot fast spin‐echo sequence was designed which employs driven equilibrium to realign transverse magnetization remaining at the final spin echo. Driven equilibrium is shown to improve T2 contrast at a given TR, or conversely to reduce TR by approximately 1000 msec and thus increase temporal resolution while maintaining a given level of contrast. Wiener demodulation of k‐space data prior to reconstruction is shown to reduce blurring caused by T2‐decay while constraining noise often associated with other inverse filters. Images are continuously acquired, reconstructed, and displayed at rates of one image every one to two seconds, while section position and contrast may be altered interactively. The clinical utility of this method is demonstrated with applications to dynamic pelvic floor imaging and interactive obstetric imaging. Magn Reson Med 44:339–348, 2000. © 2000 Wiley‐Liss, Inc.

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Interactive three-point localization of double-oblique sections using MR fluoroscopy

Cited by 9 publications

References 8 publications

Real‐time catheter tracking and adaptive imaging

Real‐time catheter tracking and adaptive imaging

Three-dimensional Contrast-enhanced MR Angiography with Real-time Fluoroscopic Triggering: Design Specifications and Technical Reliability in 330 Patient Studies

Interactive fast spin-echo imaging

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