Use of the Keyhole Technique for 3.0T MRI Dynamic Imaging

Itou, Daisuke; Nagasaka, Tatsuo; Yanagawa, Isao; Yoshida, Sayaka; Takase, Kei‐ichiro

doi:10.6009/jjrt.64.1562

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The use of keyhole imaging is particularly useful if real-time monitoring is required [28][29][30]. In static organs, such as the brain or during musculoskeletal interventions, spatial resolution appears to be more crucial than the imaging speed [31,32].…”

Section: Discussionmentioning

confidence: 99%

Reduced k-space acquisition to accelerate MR imaging of moving interventional instruments: a phantom study

et al. 2011

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Section: Discussionmentioning

confidence: 99%

Reduced k-space acquisition to accelerate MR imaging of moving interventional instruments: a phantom study

et al. 2011

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“…Disadvantages compared to DSA resulting from the simultaneous contrast agent perfusion in all vascular segments (a not insignificant advantage of DSA is the possibility of selective contrast agent administration) are compensated partly with a vascular selective excitement using what is known as arterial spin labelling (ASL) [34,158]. In the future, further insight on flow dynamics may possibly be gained through bodily region clinical problem references head carotids [95, 114 -116] cerebral arteriovenous fistulae and malformations [33, 47, 65, 117 -119] cavernous hemangioma [117,120] sinus thrombosis [33,121] multiple sclerosis [122 -124] orbital lesions [65,125] spinal column spinal arteries [30,71,126] arteriovenous fistulae and malformations [54,72,76] thorax/abdomen aortic dissection [17,127] aortic isthmus stenosis [128] pulmonary embolisms [63] pulmonary perfusion [9,10,12,13,29] pulmonary hypertension [8,11] arteriovenous malformations [36,129] endoleaks from vascular prostheses [82,130,131] subclavian steal syndrome [90] coronary vessels [132 -134] renal artery stenoses [135 -137] pelvic congestion [32,57,98,138,139] arteries of the extremities asymmetrical contrast perfusion …”

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confidence: 99%

High temporal and high spatial resolution MR angiography (4D-MRA)

Hadizadeh¹,

Marx²,

Gieseke³

et al. 2014

Fortschr Röntgenstr

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!In the first decade of the twenty-first century, whole-body magnetic resonance scanners with high field strengths (and thus potentially better signal-to-noise ratios) were developed. At the same time, parallel imaging and "echo-sharing" techniques were refined to allow for increasingly high spatial and temporal resolution in dynamic magnetic resonance angiography ("time-resolved" = TR-MRA). This technological progress facilitated tracking the passage of intra-venously administered contrast agent boluses as well as the acquisition of volume data sets at high image refresh rates ("4D-MRA"). This opened doors for many new applications in non-invasive vascular imaging, including simultaneous anatomic and functional analysis of many vascular pathologies including arterio-venous malformations. Different methods were established to acquire 4D-MRA using various strategies to acquire k-space trajectories over time in order to optimize imaging according to clinical needs. These include "keyhole"-based techniques (e. g. 4D-TRAK), TRICKS -both with and without projection -and HYPR-reconstruction, TREAT, and TWIST. Some of these techniques were first introduced in the 1980 s and 1990 s, were later enhanced and modified, and finally implemented in the products of major vendors. In the last decade, a large number of studies on the clinical applications of TR-MRA was published. This manuscript provides an overview of the development of TR-MRA methods and the 4D-MRA techniques as they are currently used in the diagnosis, treatment and follow-up of vascular diseases in various parts of the body. Key statements▶ 4D-MRA, which differs according to manufacturer, generates high temporal and spatial resolution MRA volume data sets.

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Study of Dynamic Pituitary Magnetic Resonance Imaging Using Three-dimensional Turbo Spin Echo Method at 3 Tesla MRI

Ogawa

Matsumura²,

Matsumoto³

et al. 2012

Nippon Hoshasen Gijutsu Gakkai Zasshi

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SummaryDynamic magnetic resonance (MR) imaging for pituitary microadenomas is usually performed in 2-dimensional (2D) multi-slice method which used coronal T 1 -weighted imaging with turbo spin echo (SE) method. However, on MR images using 2D multi-slice method, the detectability of small lesions between slices may decrease. Therefore, the aim of our study is to investigate the influence that imaging parameters give to T 1 -weighted image with 3-dimensional (3D) turbo SE method, and to examine the use of 3D turbo SE method as the detection of pituitary microadenomas. We can plan the shortening of imaging time by shortening repetition time (TR), because the contrast to noise ratio (CNR) in the 3D turbo SE method was superior enough than that of the 2D turbo SE method. In addition, low refocusing flip angle induced the decrease of CNR, but it has the effect which decreases flow-induced artifacts. Dynamic MR imaging which used coronal T 1 -weighted imaging with 3D turbo SE method is feasible by utilizing the reduction of TR and low refocusing flip angle, as well as the combination of parallel imaging and radial sampling.

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Use of the Keyhole Technique for 3.0T MRI Dynamic Imaging

Abstract: keyhole imaging Keyhole imaging 2 3 3.0T MRI 1.5T MRI signal to noise ratio SNR 2 4 keyhole imaging keyhole imaging artifact parameter scan parameter 5 reference keyhole imaging 3D dynamic imaging MRI Intera Achieva 3.0T Quasar Dual R2.

Cited by 4 publications

References 2 publications

Reduced k-space acquisition to accelerate MR imaging of moving interventional instruments: a phantom study

Reduced k-space acquisition to accelerate MR imaging of moving interventional instruments: a phantom study

High temporal and high spatial resolution MR angiography (4D-MRA)

Study of Dynamic Pituitary Magnetic Resonance Imaging Using Three-dimensional Turbo Spin Echo Method at 3 Tesla MRI

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