Subtle Bone Marrow Edema Assessed by Frequency Selective Chemical Shift MRI

Schick, Fritz; Bongers, H.; Aicher, Klaus P.; Jung, Wulf‐Ingo; Duda, Stephan H.; Lutz, O.

doi:10.1097/00004728-199205000-00021

Cited by 26 publications

(12 citation statements)

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“…4). 4) were implemented on a 1.0 Tesla whole body system (Siemens Expert, Erlangen, Germany). This system allows ramping the field gradient amplitude linearly from 0 to 15 mT/m in 0.6 ms. Slice thicknesses of about 2 mm can be obtained using single Hanning-filtered sinc RF pulses with one side lobe and a duration of 0.86 ms.…”

Section: Methodsmentioning

confidence: 99%

Simultaneous highly selective MR water and fat imaging using a simple new type of spectral‐spatial excitation

Schick

1998

Magnetic Resonance in Med

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In a recent contribution [MRM 38:269-274 (1997)], it was reported that an excitation by a series of sinc-shaped slice-selective RF pulses with binomial amplitude ratios and complete spin refocusing between consecutive pulses leads to water- or fat-selective images of high quality. A method for simultaneous water and fat imaging in multislice operation is presented based on the principle of alternated line scanning and linear superposition of several excitations. For example, a 1 - 3 - 3 - 1 pulse train with suitable interpulse delays results in a water-selective excitation, whereas a 1 - 3 - 3 - 1 train leads to a selective excitation of fat (transmitter frequency corresponds with the Larmor frequency of water protons). Phase cycling of the excitation (1 - 3 - 3 - 1 for the even line numbers in k-space, but 1 - 3 - 3 - 1 for the odd line numbers) causes a shift of n/2 lines in phase-encode direction for the fat signals in an n x m matrix. The principle of linear superposition explains why an excitation of 2 - 0 - 6 - 0 for the even lines and 0 - 6 - 0 - 2 for the odd lines results in a final image with unshifted water signals and shifted fat signals. Both water and fat portions are simultaneously exhibited and separated without any signal loss. Examples recorded by a gradient-echo sequence demonstrate the potential of the new technique that allows a reduction of up to 50% of measuring time compared with former frequency-selective imaging methods.

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Section: Methodsmentioning

confidence: 99%

Simultaneous highly selective MR water and fat imaging using a simple new type of spectral‐spatial excitation

Schick

1998

Magnetic Resonance in Med

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“…The T1-weighted images displayed a good contrast between infilration by tumour and the fatty bone marrow because lipids have a short relaxation time and signal intensities are low in tumours [1]. There are large amounts of lipids in bone marrow.…”

Section: Discussionmentioning

confidence: 97%

“…There are large amounts of lipids in bone marrow. T1-weighted images show no signal loss until oedema is more severe and lipids are displaced by water [1]. If a tumour contains a subacute haematoma with a high concentration of protein, the T1 signal becomes high [27].…”

Section: Discussionmentioning

confidence: 99%

Magnetic resonance chemical shift imaging in bone and soft tissue tumours

Ozaki

Sugihara

Hamada

et al. 1997

International Orthopaedics

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“…Even though T 2 -weighted fat suppressed spin echo images are most commonly used in clinical practice (1,2), 3D gradient-recalledecho (GRE) and 3D SPGR sequences with and without fat suppression are increasingly used with expanding clinical applications. Their high-resolution capability makes them most useful in small joint and small structure evaluation.…”

Section: Introductionmentioning

confidence: 99%