Experimental simulation evaluation of ECG‐gated heart scans with a small number of views

Joseph, Peter M.; Whitley, Joseph E.

doi:10.1118/1.595315

Cited by 14 publications

(16 citation statements)

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“…In our technique, undersampling projections allows the scan to be completed in a single breath‐hold. As is known in CT imaging (13), azimuthal undersampling in MR does not decrease spatial resolution but does introduce artifacts. The radial k ‐space sampling interval determines the size of an object ( D ) that can be fully reconstructed, but alias‐free reconstruction is only possible when the azimuthal spacing is equal to the radial spacing.…”

Section: Discussionmentioning

confidence: 94%

Single breath-hold 3D contrast-enhanced method for assessment of cardiac function

Barger¹,

Grist²,

Block³

et al. 2000

Magn. Reson. Med.

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Section: Discussionmentioning

confidence: 94%

Single breath-hold 3D contrast-enhanced method for assessment of cardiac function

Barger¹,

Grist²,

Block³

et al. 2000

Magn. Reson. Med.

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“…As has been previously noted in X-ray CT, the spatial resolution for projection reconstruction techniques is determined by the readout resolution (14). For PIPR the corresponding time for an image with flowencoding along all three directions is:…”

Section: Discussionmentioning

confidence: 99%

Phase-contrast with interleaved undersampled projections

et al. 2000

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“…As the number of views was reduced for high temporal rate images, the number of radial points used for reconstruction was also concomitantly reduced, yielding images with lower spatial resolution. Alternatively, one can choose to use all of the available radial points and only reduce the number of views (undersampled projection reconstruction (18, 24)). It is well known that spatial resolution in radially sampled images is determined not by the number of views used for reconstruction, but by the width of the k ‐space spanned by the readouts (the readout resolution (24)).…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, one can choose to use all of the available radial points and only reduce the number of views (undersampled projection reconstruction (18, 24)). It is well known that spatial resolution in radially sampled images is determined not by the number of views used for reconstruction, but by the width of the k ‐space spanned by the readouts (the readout resolution (24)). This strategy can thus provide a single image set with both high temporal and high spatial resolutions.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous acquisition of multiple resolution images for dynamic contrast enhanced imaging of the breast

Song

Dougherty

Schnall

2001

Magnetic Resonance in Med

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An imaging technique is described that allows the reconstruction of a series of images at high temporal rates, while simultaneously providing images at high spatial resolution. The method allows one to arbitrarily choose from among several combinations of temporal/spatial resolutions during postprocessing. This flexibility is accomplished by strategically interleaving multiple undersampled projection reconstruction datasets (or subapertures), in which each set can be used to reconstruct a high temporal resolution image. Gadolinium contrast-enhanced dynamic imaging is commonly used to diagnose suspicious breast lesions. Both the kinetics of contrast enhancement (1-4) and lesion morphology (5-7) are considered in determining the malignancy of these lesions. The quantitative modeling of enhancement kinetics is best achieved when images are acquired at high temporal rates, on the order of tens of seconds (8,9), while obtaining detailed lesion morphology requires high spatial resolution. Unfortunately, simultaneous acquisition of both high spatial and temporal resolutions is difficult, due to their diverging demands. The high spatial resolution imaging required to distinguish features necessary for the fine architectural information requires a relatively long time to acquire. For example, to image the entire breast a 3D acquisition of 32 slices with a sampling matrix of 512 ϫ 384, takes ϳ100 sec using a repetition time (TR) ϭ 8 ms. Acquiring fewer slices or reducing the matrix size will speed acquisition, but at the cost of coverage or spatial resolution.In order to improve the temporal resolution of the image series, the well-known "keyhole" technique (10,11) has been used in some breast imaging studies (1). In this technique, only the low spatial frequencies along the phase encoding (k y ) direction are acquired at short intervals and the full resolution images are reconstructed by substituting the outer k y -space regions by reference data collected either pre-or postcontrast. One of the drawbacks of this technique is that artifacts can arise from mixing the constantly updated low spatial frequency data with the high frequency data acquired at different (noncontiguous) time periods (9,12,13). Besides potential subject motion between the acquisition of different k-space regions, the high resolution features of the final image may not be enhanced. Other related acquisition schemes have been developed to reduce these artifacts, such as CURE, a pseudo-randomized view acquisition scheme (14), and 3D TRICKS, in which the high spatial frequency data are also periodically updated (although not as frequently as the low spatial frequency) (15,16). Although they may provide more accurate, time-resolved images, the inevitable mixing of old and new data that are noncontiguous in time still occurs with these methods, potentially leading to measurement errors.In this work, a projection reconstruction (PR) imaging technique is described that allows acquisition of high temporal resolution images while simultaneously allowing the r...

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Experimental simulation evaluation of ECG‐gated heart scans with a small number of views

Cited by 14 publications

References 0 publications

Single breath-hold 3D contrast-enhanced method for assessment of cardiac function

Single breath-hold 3D contrast-enhanced method for assessment of cardiac function

Phase-contrast with interleaved undersampled projections

Simultaneous acquisition of multiple resolution images for dynamic contrast enhanced imaging of the breast

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