Simultaneous slice excitation for accelerated passive marker tracking via phase-only cross correlation (POCC) in MR-guided needle interventions

Reichert, Andreas; Bock, Michael; Reiss, Simon; Overduin, Christiaan G.; Fütterer, Jurgen J.; Krafft, Axel J.

doi:10.1007/s10334-018-0701-0

Cited by 4 publications

(15 citation statements)

References 19 publications

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“…The system was intuitive to use, no special training was required, and the surrounding adjacent targets were not unintentionally perforated. The mean procedure duration (6.5 min) and the lateral accuracy (1.7 mm) in this evaluation are comparable to values found in previous studies (22, 33–35).…”

Section: Discussionsupporting

confidence: 89%

“…All these procedures would benefit from acceleration of the POCC tracking sequence. This can be achieved, for example, with simultaneous acquisition of the tracking images (35) or with radially undersampled projection imaging of the passive marker (40). A higher temporal resolution would allow better tracing of anatomical targets during breathing motion.…”

Section: Discussionmentioning

confidence: 99%

“…For device tracking during the targeting, the GantryMate system was equipped with a cylindrical passive marker needle-guide (inner/outer diameter = 5/13 mm, length = 62.5 mm) filled with a contrast agent solution (Magnevist ® /H 2 O: 1/100, Bayer Schering Pharma AG, Berlin, Germany). To automatically determine the position and orientation of the passive marker, a previously developed tracking sequence was used (22, 33–35). The sequence acquires 2 T1-weighted gradient echo (FLASH) images, which are oriented perpendicular to the marker's symmetry axis.…”

Section: Methodsmentioning

confidence: 99%

“…We tested the assistance system according to American Society for Testing and Materials (ASTM) standards (28–32), and we verified if the MR system's radiofrequency and magnetic fields remain unaffected. To enable automatic scan plane positioning, we combined GantryMate with a tracking MRI sequence to automatically detect a passive marker needle-guide and followed the device motion during targeting in real time (22, 33–35). In a phantom setting, the lateral puncture accuracy of needle placements, as well as the procedure time, was assessed.…”

Section: Introductionmentioning

confidence: 99%

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GantryMate: A Modular MR-Compatible Assistance System for MR-Guided Needle Interventions

Reichert

Bock

Vogele³

et al. 2019

Tomography

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Percutaneous minimally invasive interventions are difficult to perform in closed-bore high-field magnetic resonance systems owing to the limited space between magnet and patient. To enable magnetic resonance–guided needle interventions, we combine a small, patient-mounted assistance system with a real-time instrument tracking sequence based on a phase-only cross-correlation algorithm for marker detection. The assistance system uses 2 movable plates to align an external passive marker with the anatomical target structure. The targeting accuracy is measured in phantom experiments, yielding a precision of 1.7 ± 1.0 mm for target depths up to 38 ± 13 mm. In in vivo experiments, the possibility to track and target static and moving structures is demonstrated.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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GantryMate: A Modular MR-Compatible Assistance System for MR-Guided Needle Interventions

Reichert

Bock

Vogele³

et al. 2019

Tomography

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“…The POCC sequence 8,[20][21][22] automatically follows the movements of a cylindrical passive needle guide with a central opening for needle insertions ( Figure 1A). The sequence acquires two parallel Cartesian T1-weighted fast low-angle shot (FLASH) images oriented perpendicular to the symmetry axis of the needle guide which is filled with a solution or gel with short T1 and appears in the image as a ring with positive contrast ( Figure 1B).…”

Section: Passive Tracking Sequencementioning

confidence: 99%

Passive needle guide tracking with radial acquisition and phase‐only cross‐correlation

Reichert

Reiss

Krafft

et al. 2020

Magnetic Resonance in Med

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Purpose Acceleration of a passive tracking sequence based on phase‐only cross‐correlation (POCC) using radial undersampling. Methods The phase‐only cross‐correlation (POCC) algorithm allows passive tracking of interventional instruments in real‐time. In a POCC sequence, two cross‐sectional images of a needle guide with a positive MR contrast are continuously acquired from which the instrument trajectory is calculated. Conventional Cartesian imaging for tracking is very time consuming; here, a higher temporal resolution is achieved using a highly undersampled radial acquisition together with a modified POCC algorithm that incorporates the point‐spread‐function. Targeting and needle insertion is performed in two phantom experiments with 16 fiducial targets, each using 4 and 16 radial projections for passive tracking. Additionally, targeting of eight deep lying basivertebral veins in the lumbar spines is performed for in vivo proof‐of‐application with four radial projections for needle guide tracking. Results The radially undersampled POCC sequence yielded in the phantom experiments a lateral targeting accuracy of 1.1 ± 0.4 mm and 1.0 ± 0.5 mm for 16 and 4 radial projections, respectively, without any statistically significant difference. In the in vivo application, a mean targeting duration of 62 ± 13 s was measured. Conclusion Radial undersampling can drastically reduce the acquisition time for passive tracking in a POCC sequences for MR‐guided needle interventions without compromising the targeting accuracy.

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Sub-millisecond 2D MRI of the vocal fold oscillation using single-point imaging with rapid encoding

Fischer

Özen

İlbey

et al. 2021

Magn Reson Mater Phy

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Objective The slow spatial encoding of MRI has precluded its application to rapid physiologic motion in the past. The purpose of this study is to introduce a new fast acquisition method and to demonstrate feasibility of encoding rapid two-dimensional motion of human vocal folds with sub-millisecond resolution. Method In our previous work, we achieved high temporal resolution by applying a rapidly switched phase encoding gradient along the direction of motion. In this work, we extend phase encoding to the second image direction by using single-point imaging with rapid encoding (SPIRE) to image the two-dimensional vocal fold oscillation in the coronal view. Image data were gated using electroglottography (EGG) and motion corrected. An iterative reconstruction with a total variation (TV) constraint was used and the sequence was also simulated using a motion phantom. Results Dynamic images of the vocal folds during phonation at pitches of 150 and 165 Hz were acquired in two volunteers and the periodic motion of the vocal folds at a temporal resolution of about 600 µs was shown. The simulations emphasize the necessity of SPIRE for two-dimensional motion encoding. Discussion SPIRE is a new MRI method to image rapidly oscillating structures and for the first time provides dynamic images of the vocal folds oscillations in the coronal plane.

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Simultaneous slice excitation for accelerated passive marker tracking via phase-only cross correlation (POCC) in MR-guided needle interventions

Abstract: POMP-POCC tracking can substantially reduce the duration of localization of passive markers in MR-guided needle interventions without compromising targeting accuracy.

Cited by 4 publications

References 19 publications

GantryMate: A Modular MR-Compatible Assistance System for MR-Guided Needle Interventions

GantryMate: A Modular MR-Compatible Assistance System for MR-Guided Needle Interventions

Passive needle guide tracking with radial acquisition and phase‐only cross‐correlation

Sub-millisecond 2D MRI of the vocal fold oscillation using single-point imaging with rapid encoding

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