Centric scan SPRITE magnetic resonance imaging: optimization of SNR, resolution, and relaxation time mapping

Halse, Meghan E.; Rioux, James A.; Romanzetti, Sandro; Kaffanke, J.; MacMillan, Bryce; Mastikhin, Igor V.; Shah, N. Jon; Aubanel, Eric; Balcom, Bruce J.

doi:10.1016/j.jmr.2004.04.008

Cited by 96 publications

(113 citation statements)

References 11 publications

(16 reference statements)

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“…Segmented acquisitions are required with these approaches. Various methods have been developed for this type of characterization (61,62). The low peak B 1 presently available on whole-body clinical MR systems may limit the utility of SPRITE methods, but human in vivo measurements have been made (63).…”

Section: Spi and Spritementioning

confidence: 99%

Clinical ultrashort echo time imaging of bone and other connective tissues

2006

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The background underpinning the clinical use of ultrashort echo time, SPRITE and other pulse sequences for imaging bone and other connective tissues with short T 2 is reviewed. Features of the basic physics relevant to UTE imaging are described, including the consequences when the radiofrequency pulse duration is of the order of T 2 so that rotation of tissue magnetization into the transverse plane is incomplete. Consequences of the broad linewidth of short T 2 components are also discussed, including partial saturation by off-resonance fat suppression pulses as well as those used in multislice and multiecho imaging. The need for rapid data acquisition of the order of T 2 is explained. The basic two-dimensional UTE pulse sequence with its half excitation pulse and radial imaging from the centre of k-space is described, together with options that suppress fat and/or reduce the signal from long T 2 components. The basic features of SPRITE and other sequences with very short TE are described. Image interpretation is discussed. Clinical features of the imaging of cortical bone, tendons, ligaments, menisci, periosteum and the spine are illustrated. The source of the short T 2 signal in these tissues is predominantly collagen and water tightly bound to collagen. Short T 2 components in all of these tissues are detectible and may show high signals. Possible future developments are outlined, as are technical limitations of clinical magnetic resonance systems.

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Section: Spi and Spritementioning

confidence: 99%

Clinical ultrashort echo time imaging of bone and other connective tissues

2006

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“…This greatly reduces imaging times, minimizes gradient vibration and also enables the introduction of quantitative T 1 contrast or T 1 suppression, into a variety of images. This sequence is called SPRITE [8,10].…”

Section: Single-point Ramped Imaging With T 1 Enhancement (Sprite)mentioning

confidence: 99%

“…Similarly, the use of 1 H MRI to map the immobile leaf constituents in tobacco filler inside cigarettes requires special 1 H pulse methods developed specifically for imaging solid materials. Single-point imaging (SPI) [4][5][6][7] and single-point ramped imaging with T 1 enhancement (SPRITE) [8][9][10][11][12][13] are two methods that meet this requirement [1].…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging characterization of intact smoked cigarettes

Axelson¹,

Wooten²

2007

Journal of Analytical and Applied Pyrolysis

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“…When the Tp changes, it is compensated by a variation in gradient amplitude maintaining the same FOV between different Tp acquisitions. This method is slower than the multiple Tp approach introduced by Halse et al [20] but avoids extra blurring in the images.…”

Section: Discussionmentioning

confidence: 95%

Diagonal-SPRITE and Its Applications for In Vivo Imaging at High Field

Protti¹,

Herlihy²,

So³

et al. 2009

TOMRJ

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Abstract:Many solid or semi-solid tissues have ultra-short or short T2* components that make them virtually "invisible" to standard MRI techniques. For this reason, methods such as ultra-short echo time (UTE) techniques were developed to investigate and detect some of these short and ultra-short time components. Here we report on the development and implementation of a novel version of the Single Point Ramped Imaging with T1 Enhancement (SPRITE) technique in order to image mouse models. The method, called diagonal-SPRITE, was optimized within hardware limitations such as duty cycle and gradient strength at high field. Preliminary in vivo MR T2* value of organs of normal mouse models and related T2* maps were generated. In addition, the sequence was applied to highlight stomach short T2* after the application of a long T2* suppression pulse and to achieve a positive contrast in a SPIO-labelled cells experiment.

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Centric scan SPRITE magnetic resonance imaging: optimization of SNR, resolution, and relaxation time mapping

Cited by 96 publications

References 11 publications

Clinical ultrashort echo time imaging of bone and other connective tissues

Clinical ultrashort echo time imaging of bone and other connective tissues

Magnetic resonance imaging characterization of intact smoked cigarettes

Diagonal-SPRITE and Its Applications for In Vivo Imaging at High Field

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