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  • 1
    Electronic Resource
    Electronic Resource
    A T1-weighted rapid three-dimensional gradient-echo technique (MP-RAGE) in preoperative MRI of intracranial tumours (1996)
    Springer
    Neuroradiology 38 (1996), S. 199-206 
    Details
    ISSN: 1432-1920
    Keywords: Magnetic resonance imaging ; Pulse sequences ; 3D ; Intracranial tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Oar purpose was to determine the value of a T1-weighted rapid three-dimensional gradientecho technique in preoperative MRI of brain tumours. We examined 30 patients with intracranial tumours who underwent neurosurgery, using T1-wighted magnetisation-prepared rapid gradient-echo (MP-RAGE) and axial T1-weighted spin-echo (SE) sequences, both before and after contrast medium (Gd-DTPA). Signal and contrast behaviour of anatomical and pathological structures were assessed with regions-of-interest (ROI) and visual inspection. Imaging results were compared with operative results. In 5 cases tumours and anatomical structure were segmented in MP-RAGE data sets. The MP-RAGE sequence considerably improved delineation of grey and white matter and small anatomical structures (vessels, cranial nerves), and significantly reduced flow artefacts. Contrast behaviour of tumours was similar with both techniques. Correlation of imaging with the operative results confirmed the reliability of the MP-RAGE sequence. Segmentation of MP-RAGE data sets allows three-dimensional display, which enables one to document the relevant information on a few images in selected cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596528
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A T1-weighted rapid three-dimensional gradient-echo technique (MP-RAGE) in preoperative MRI of intracranial tumours (1996)
    Springer
    Neuroradiology 38 (1996), S. 199-206 
    Details
    ISSN: 1432-1920
    Keywords: Key words Magnetic resonance imaging ; Pulse sequences ; 3 D ; Intracranial tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to determine the value of a T1-weighted rapid three-dimensional gradient-echo technique in preoperative MRI of brain tumours. We examined 30 patients with intracranial tumours who underwent neurosurgery, using T1-weighted magnetisation-prepared rapid gradient-echo (MP-RAGE) and axial T1-weighted spin-echo (SE) sequences, both before and after contrast medium (Gd-DTPA). Signal and contrast behaviour of anatomical and pathological structures were assessed with regions-of-interest (ROI) and visual inspection. Imaging results were compared with operative results. In 5 cases tumours and anatomical structures were segmented in MP-RAGE data sets. The MP-RAGE sequence considerably improved delineation of grey and white matter and small anatomical structures (vessels, cranial nerves), and significantly reduced flow artefacts. Contrast behaviour of tumours was similar with both techniques. Correlation of imaging with the operative results confirmed the reliability of the MP-RAGE sequence. Segmentation of MP-RAGE data sets allows three-dimensional display, which enables one to document the relevant information on a few images in selected cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596528
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    True proton density and T2-weighted turbo spin-echo sequences for routine MRI of the brain (1994)
    Springer
    Neuroradiology 36 (1994), S. 591-597 
    Details
    ISSN: 1432-1920
    Keywords: MRI ; Brain ; Turbo spin-echo (TSE) ; Fast spin-echo (FSE) ; Proton-density contrast ; Rapid imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our aim was to evaluate the diagnostic reliability of turbo spin-echo (TSE) sequences compared to a conventional dual-echo spin-echo (SE) sequence in routine brain MRI at 1.0 T. The following demands were made on TSE sequences: acquisition time-reduction of at least 50% and true proton density (PD) contrast (lowsignal cerebrospinal fluid). A conventional spin-echo and two single-echo TSE sequences were used in 150 patients, a dual-echo TSE sequence in addition in 50 patients. Demonstration of most anatomical structures and disorders was equivalent with TSE and SE sequences. Advantages of TSE were reduced flow artefacts on T2-weighted images, better lesion contrast on PD-weighted TSE images (especially in the dual-echosequence) and acquisition time reduction to about 5 min (single-echo TSE) and 3∶35 min (dual-echo TSE). Disadvantages of TSE were: reduced contrast of tron-containing substances such as heamosiderin and of areas of calcification. By virtue of the shorter acquisition time and diagnostic reliability dual-echo TSE proved the best sequence. If it is used with only one acquisition-whereby image quality but not diagnostic reliability is slightly decreased — acquisition time can be further reduced to 1∶48 min. Application of a susceptibility-sensitive gradient-echo sequence, such as FLASH, compensates for the disadvantages mentioned above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600415
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Turbo spin-echo sequences in magnetic resonance imaging of the brain: Physics and applications (1994)
    Springer
    Magnetic resonance materials in physics, biology and medicine 2 (1994), S. 51-59 
    Details
    ISSN: 1352-8661
    Keywords: MRI ; brain ; FSE ; fast spin-echo sequences ; TSE ; turbo spin-echo sequences ; signal behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract Fast SE imaging provides considerable measure time reduction, high signal-to-noise ratios as well as similar contrast behavior compared to conventional SE sequences. Besides TR and TEeff, echo train length (ETL), interecho time τ, andκ-space trajectory determine image contrast and image quality in fast SE sequences. “True” proton density contrast (CSF hypointense) and not too strong T2 contrast are essential requirements in routine brain MRI. A Turbo SE sequence with very short echo train length (ETL=3), short TEeff and short interecho time (17 ms), and TR=2000 ms was selected for proton density contrast; a Turbo SE sequence with ETL=7, TEeff=90 ms, τ=22 ms, and TR=3250 ms was selected for T2-weighted images. Using both single-echo Turbo SE sequences yielded 50% measure time reduction compared to the conventional SE technique. Conventional SE and optimized Turbo SE sequences were compared in 150 patients resulting in very similar signal and contrast behavior. Furthermore, reduced flow artifacts in proton density—and especially in T2-weighted Turbo SE images—and better contrast of high-intensity lesions in proton density-weighted Turbo SE images were found. Slightly reduced edge sharpness—mainly in T2-weighted Turbo SE images—did not reduce diagnostic reliability. Differences between conventional and Turbo SE images concerning image contrast and quality are explained regarding special features of fast SE technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01709800
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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