Improved means of correcting motion blurring in scintigraphic images

McKeighen, R.E.

doi:10.1088/0031-9155/24/2/011

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…The central frequency shift (⌬ 0 ϭ ␥⌬B 0 ) can then be calculated using Eq. [6], and the image displacement after Fourier transformation can be obtained from Eq. [8].…”

Section: Phantom Experimentsmentioning

confidence: 99%

“…The relationship between image displacement and ⌬ 0 ( ϭ ␥⌬B 0 ) was obtained from Eq. [6] and Eq. [8].…”

Section: Fmri Experimentsmentioning

confidence: 99%

“…For correction of a rigid body shift (eg, caused by B 0 drift), one possible method is by measurement of centroid displacement (5,6) and then applying an image shift with linear, sinc, or Fourier interpolations (7,8). The navigator echo technique has been used, besides for image registration, to reduce motion artifacts in conventional spin-echo imaging (9), signal fluctuation in conventional gradient-echo fMRI images (10), and both through-plane and rotational motion artifacts in EPI fMRI (11,12).…”

mentioning

confidence: 99%

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Comparison of navigator echo and centroid corrections of image displacement induced by static magnetic field drift on echo planar functional MRI

Liu

Kochunov

Lancaster

et al. 2001

J. Magn. Reson. Imaging

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“…The central frequency shift (⌬ 0 ϭ ␥⌬B 0 ) can then be calculated using Eq. [6], and the image displacement after Fourier transformation can be obtained from Eq. [8].…”

Section: Phantom Experimentsmentioning

confidence: 99%

“…The relationship between image displacement and ⌬ 0 ( ϭ ␥⌬B 0 ) was obtained from Eq. [6] and Eq. [8].…”

Section: Fmri Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Comparison of navigator echo and centroid corrections of image displacement induced by static magnetic field drift on echo planar functional MRI

Liu

Kochunov

Lancaster

et al. 2001

J. Magn. Reson. Imaging

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“…Patient movements are a specific problem in the management of babies and children but may be troublesome also for non-collaborating patients or very long examinations. Movement corrections can be obtained with manual realignment of the frames, a technique which is not sufficiently precise and reproducible "per se", or by the use of anatomical markers superimposed on the images, which has limitations related both to the need of a large field-of-view (to encompass the markers themselves) and to the interference of the marker's activity with the radionuclide distribution (Barber 1982;McKeighen 1979;Vidiukov and Rotenberg 1982).…”

Section: Eur J Nucl Med (1992) 19:476-483mentioning

confidence: 99%

A motion correction algorithm for an image realignment programme useful for sequential radionuclide renography

et al. 1992

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The correction of organ movements in sequential radionuclide renography was done using an iterative algorithm that, by means of a set of rectangular regions of interest (ROIs), did not require any anatomical marker or manual elaboration of frames. The realignment programme here proposed is quite independent of the spatial and temporal distribution of activity and analyses the rotational movement in a simplified but reliable way. The position of the object inside a frame is evaluated by choosing the best ROI in a set of ROIs shifted 1 pixel around the central one. Statistical tests have to be fulfilled by the algorithm in order to activate the realignment procedure. Validation of the algorithm was done for different acquisition set-ups and organ movements. Results, summarized in Table 1, show that in about 90% of the simulated experiments the algorithm is able to correct the movements of the object with a maximum error less or equal to 1 pixel limit. The usefulness of the realignment programme was demonstrated with sequential radionuclide renography as a typical clinical application. The algorithm-corrected curves of a 1-year-old patient were completely different from those obtained without a motion correction procedure. The algorithm may be applicable also to other types of scintigraphic examinations, besides functional imaging in which the realignment of frames of the dynamic sequence was an intrinsic demand.

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“…Moreover, because becomes large with an increase in frequency, the of the acoustic lens has a great effect on the sensitivity of a medical ultrasonic probe. 1) Silicone rubber has been the predominant externally focused acoustic lens material applied since 1970 2) because it is safe to use with the human body, has a suitable c (c $ 1000 m/s), and a reasonably low ( $ 0:3 dB mm À1 MHz À1 ). However, the of pure silicone rubber is approximately 0:97 Â 10 3 kg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Ceramic Nanopowder Dopants on Acoustic Attenuation Properties of Silicone Rubber Lens for Medical Echo Probe

Yohachi

John²,

Hosono

et al. 2007

jjap

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with primary particle sizes of 16 -100 nm, on the acoustic properties of silicone rubber have been investigated, in order to develop an acoustic lens material for medical echo probes with a low acoustic attenuation (). Silicone rubber doped with Yb 2 O 3 powder having a high density () of 9:2 Â 10 3 kg/m 3 and an average particle size of 16 nm showed a lower acoustic attenuation than silicone rubber doped with other powders. The materials showed ¼ 1:54 Â 10 3 kg/m 3 , a sound velocity ðcÞ ¼ 882 m/s, an acoustic impedance Á cðZÞ ¼ 1:36 Â 10 6 kg m À2 s À1 , and an acoustic attenuation ¼ 0:93 dB mm À1 MHz À1 at 37 C. Silicone rubber doped with Fe 2 O 3 powder having ¼ 5:2 Â 10 3 kg/m 3 and an average particle size of 30 nm showed the highest ¼ 2:36 dB mm À1 MHz À1 and Z ¼ 1:47 Â 10 6 kg m À2 s À1 . Microstructure observation of the rubber by scanning microscopy revealed that the of the powder-doped rubber is not only determined by the primary particle size of the powders but also by the dispersion and agglomeration of the secondary particles in the rubber matrix. The discovery of the process parameter required to reduce the of the nanopowder-doped silicone rubber has an important practical consequence.

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Improved means of correcting motion blurring in scintigraphic images

Cited by 5 publications

References 1 publication

Comparison of navigator echo and centroid corrections of image displacement induced by static magnetic field drift on echo planar functional MRI

Comparison of navigator echo and centroid corrections of image displacement induced by static magnetic field drift on echo planar functional MRI

A motion correction algorithm for an image realignment programme useful for sequential radionuclide renography

Effects of Ceramic Nanopowder Dopants on Acoustic Attenuation Properties of Silicone Rubber Lens for Medical Echo Probe

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