Planar gradient coil design by scaling the spatial frequencies of minimum‐inductance current density

Lee, Soo Y.; Park, Bu S.; Yi, Jeong-Han; Wan, Yi

doi:10.1002/mrm.1910380525

Cited by 17 publications

(18 citation statements)

References 10 publications

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“…In planar gradient coil geometry, the y ‐gradient has two fingerprint winding patterns along the z ‐axis with current flowing clockwise on one loop and counterclockwise on the other loop. Unlike cylindrical gradient coils where the x ‐gradient pattern can be obtained with a 90° rotation of the y ‐gradient, the x ‐gradient for planar gradient coils is achieved with windings that are laid out as a 2 × 2 fingerprint pattern on each plane with current flowing clockwise and counterclockwise alternatively (10–20).…”

Section: Theorymentioning

confidence: 99%

Pediatric and Adult Interventional Cardiac Symposium (PICS/AICS 2010)

2010

Cathet Cardio Intervent

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Introduction: Pulmonary artery (PA) rehabilitation is one of the most common procedures performed in the cardiac catheterization laboratory, but solid data on procedure-related adverse events (AE) is scarce with most studies reporting small retrospective, single center experiences. Methods: Data was prospectively collected using a multi-center registry (C3PO). Between 02/07 and 12/09, 8 institutions submitted details on 1315 procedures (proc) that included either balloon angioplasty or stent implantation within a proximal or lobar branch PA. Results: The majority of patients (pts) had either complex 2-ventricle circulation (71%), or single-ventricle physiology (22%). The median age was 3.5 years (1d -70yr). Out of 2894 PA intervention, balloon angioplasty was performed in 51% (>8Atm in 34%), cutting balloon angioplasty in 14%, stent-angioplasty in 14%, and stent implantation in 21%. Procedures included interventions on proximal PAs in 60%, lobar branches in 17%, or both in 23%. Four or more PA lesions were treated in 9% proc. 81% of cutting balloons were used in lobar branches, whereas 82% of all stents were used in proximal branch PAs. Additional interventions were performed in 38% proc. Out of 324 total AE 53% were observed in 815 proc without additional cath interventions: No more than minor AE were documented in 9% proc; moderate/major/ catastrophic (level 3-5) AE were documented in 9% proc. 0.1% patients died as a direct result of the procedure. Type of AE included arrhythmias (16%), hypoxia or hypotension (10%), bleed via ET tube/reperfusion injury (16%), vascular trauma/tear/ aneurysm (19%), balloon rupture/stent migration/ malposition and stentrelated problems (14%), AE at vascular entry site (9%), and other AE (16%). AE were classified as not preventable in 49%, as possibly preventable in 43%, and as preventable in 8%. Factors associated with an increased incidence of level 3-5 AE included age <1 month (31% vs. 10%), date since last surgery <30 days (22% vs. 9%), number of treated lesions >4 (20% vs. 9%). There was a trend for increased risk of AE in pts with complex 2-ventricle and suprasystemic RV (21% vs. 14%). The incidence of level 3-5 AE was not related to weight, use of inotropes at start, location (proximal/lobar) and single vs. complex 2v. Conclusion: PA rehab is associated with not insignificant morbidity. Neonates, early postop period, and multi-level rehab are risk factors for level 3-5 AE.Background: Transcatheter treatment of many congenital and structural heart defects became the method of treatment. Recently new device -Cardio-O-Fix (COF) was introduced into clinical practice. Methods: Five patients aged 0,5 -69 years were included to the study -2 with ASD, 1 with PFO and cryptogenic stroke, and 2 with PDA (one 6 months old infant with additional hypertrophied cardiomyopathy, and 53 y old women after previous ligation of PDA with its recanalization). All were treated percuatneously with Cardio-O-Fix Occluders. There were no preliminary patient selection -the only limitation was the size o...

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Section: Theorymentioning

confidence: 99%

Pediatric and Adult Interventional Cardiac Symposium (PICS/AICS 2010)

2010

Cathet Cardio Intervent

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“…Since the minimum intensity regions in Fig. 12 correspond to the extra phase, ϭ 2n, the difference in field among them is ⌬B ϭ 2 ␥TE ϭ 11.74 mG, [11] and the local field gradient can be obtained from the spatial distance between the minima. The linearity of the gradients is shown in Fig.…”

Section: Field Linearitymentioning

confidence: 99%

“…The TF method for planar geometries, first introduced by Yoda (8), was applied to design gradient coils with minimum inductance for axial magnets (10,11), but due to limitations on coil size the uniformity region is restricted.…”

Section: Introductionmentioning

confidence: 99%

Fast Optimization of a Biplanar Gradient Coil Set

Tomasi

Caparelli

Panepucci

et al. 1999

Journal of Magnetic Resonance

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“…However, some developments in gradient coil design have been made in the last decade. Gradient coils with novel geometries [3][4][5][6] were introduced for applications in specific tissues or samples. Designs for these novel geometric gradients usually depend on novel mathematical methods.…”

Section: Introductionmentioning

confidence: 99%