Capturing Signals from Fast-relaxing Spins with Frequency-Swept MRI: SWIFT

Idiyatullin, Djaudat; Corum, Curtis A.; Chamberlain, Ryan; Moeller, Steen; Kobayashi, Naoharu; Lehto, Lauri J.; Zhang, Jinjin; O’Connell, Robert; Tesch, Michael; Nissi, Mikko J.; Ellermann, Jutta; Nixdorf, Donald R.

doi:10.1002/9780470034590.emrstm1259

Cited by 22 publications

(36 citation statements)

References 69 publications

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“…SWIFT has an effective TE of almost 0 due to the nearly simultaneous excitation and acquisition, so there is no T 2 -weighting in familiar tissues, and some normally poorly visualized tissues can be visualized (such as tendon and bone) [3, 5, 7]. For purposes of ultra-short T 2 contrast, SWIFT has a TE of 10 μs for the scans and reconstructions in this study.…”

Section: Methodsmentioning

confidence: 99%

“…SWeep Imaging with Fourier Transformation (SWIFT) [3–5] is an emerging MR imaging technique that is being investigated for use in a variety of different applications [5, 6]. Unlike conventional MRI, in which excitation by a radiofrequency (RF) pulse and acquisition of the signal are separated by an echo time (TE) of 1 millisecond or longer, SWIFT utilizes nearly simultaneous sweep excitation and acquisition [3–5].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike conventional MRI, in which excitation by a radiofrequency (RF) pulse and acquisition of the signal are separated by an echo time (TE) of 1 millisecond or longer, SWIFT utilizes nearly simultaneous sweep excitation and acquisition [3–5]. SWIFT utilizes 3D radial k-space sampling, with the orientation of the readout gradient being updated in small increments instead of being pulsed on and off (or reversed).…”

Section: Introductionmentioning

confidence: 99%

“…SWIFT utilizes 3D radial k-space sampling, with the orientation of the readout gradient being updated in small increments instead of being pulsed on and off (or reversed). This leads to very low sound pressure level and minimal eddy currents in the scanner [3, 5]. Together these characteristics make SWIFT useful for imaging objects with extremely fast effective transverse relaxation times, T 2 *, [3, 5, 7], reduced sensitivity to the subject motion [8], and minimized signal dropout due to field inhomogeneities [6].…”

Section: Introductionmentioning

confidence: 99%

“…This leads to very low sound pressure level and minimal eddy currents in the scanner [3, 5]. Together these characteristics make SWIFT useful for imaging objects with extremely fast effective transverse relaxation times, T 2 *, [3, 5, 7], reduced sensitivity to the subject motion [8], and minimized signal dropout due to field inhomogeneities [6]. SWIFT possesses a number of characteristics that are desirable for routine MR breast cancer screening, diagnosis, staging, and treatment monitoring, including the ability to simultaneously image at high isotropic spatial and high temporal resolutions, and robustness to hardware drifts [9, 10].…”

Section: Introductionmentioning

confidence: 99%

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High-Spatial- and High-Temporal-Resolution Dynamic Contrast-enhanced MR Breast Imaging with Sweep Imaging with Fourier Transformation: A Pilot Study

Corum¹,

Benson²,

Idiyatullin³

et al. 2015

Radiology

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Purpose To report the results of SWeep Imaging with Fourier Transformation (SWIFT) MR imaging for diagnostic breast imaging. Materials and Methods Informed consent was obtained from all subjects under one of two IRB-approved, HIPAA-compliant protocols. Twelve female patients (age range 19–54 years; mean age 41.2) and eight normal controls (age range 22–56 years; mean age 43.2) enrolled and completed the study from 1/28/2011 to 3/5/2013. Patients had previous findings of BI-RADS 4 and 5 based on mammography and/or ultrasound. Contrast-enhanced SWIFT imaging was completed using a Siemens/Agilent 4 T research MRI system. Non-contrast studies were completed on the normal controls. One of two sized single breast SWIFT-compatible transceiver coils was used for nine patients and five controls. Three patients and five controls used a SWIFT-compatible dual breast coil. Temporal resolution was 5.9 to 7.5 seconds. Spatial resolution was 1.00 mm isotropic initially, with later scans at 0.67 mm isotropic, and dual breast at 1.00 mm or 0.75 mm isotropic resolution. Results Two unblinded breast radiologists reported SWIFT image findings of normal breast tissue, benign fibroadenomas (N=6/6), and malignant lesions (N=10/12) concordant with other imaging modalities and pathology reports. Two lesions (in two patients) were not visualized due to coil field of view. The images yielded by SWIFT showed the presence and extent of known breast lesions. Conclusions The SWIFT technique could become an important addition to the repertoire of breast imaging modalities due to its ability to provide high spatial resolution at all time points during the dynamic contrast exam.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-Spatial- and High-Temporal-Resolution Dynamic Contrast-enhanced MR Breast Imaging with Sweep Imaging with Fourier Transformation: A Pilot Study

Corum¹,

Benson²,

Idiyatullin³

et al. 2015

Radiology

Self Cite

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Sweep Imaging with Fourier Transformation (SWIFT)

Idiyatullin¹

2022

Magnetic Resonance Microscopy

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UTE imaging in the musculoskeletal system

Chang

Chung

2014

Magnetic Resonance Imaging

226

252

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Tissues, such as bone, tendon, and ligaments, contain a high fraction of components with “short” and “ultrashort” transverse relaxation times and therefore have short mean transverse relaxation times. With conventional MRI sequences that employ relatively long echo times (TEs), there is no opportunity to encode the decaying signal of short and ultrashort T2/T2* tissues before it has reached zero or near zero. The clinically compatible ultrashort TE (UTE) sequence has been increasingly used to study the musculoskeletal system. This article will review the UTE sequence as well as various modifications that have been implemented since its introduction. These modifications have been used to improve efficiency or contrast as well as provide quantitative analysis. This article also reviews several clinical musculoskeletal applications of UTE.

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Capturing Signals from Fast-relaxing Spins with Frequency-Swept MRI: SWIFT

Cited by 22 publications

References 69 publications

High-Spatial- and High-Temporal-Resolution Dynamic Contrast-enhanced MR Breast Imaging with Sweep Imaging with Fourier Transformation: A Pilot Study

High-Spatial- and High-Temporal-Resolution Dynamic Contrast-enhanced MR Breast Imaging with Sweep Imaging with Fourier Transformation: A Pilot Study

Sweep Imaging with Fourier Transformation (SWIFT)

UTE imaging in the musculoskeletal system

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