Dynamic imaging by model estimation

Liang, Zhi Pei; Jiang, Hong; Hess, Christopher P.; Lauterbur, Paul C.

doi:10.1002/(sici)1098-1098(1997)8:6<551::aid-ima7>3.0.co;2-9

Cited by 80 publications

(73 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, reconstruction can be performed separately for each k, thereby simplifying the computation significantly. In this case, UNFOLD is similar to the dynamic imaging by motion estimation (DIME) method (12).…”

Section: Unfold Fmrimentioning

confidence: 99%

On the UNFOLD method

Tsao

2001

Magnetic Resonance in Med

View full text Add to dashboard Cite

A graphical formalism is presented, showing that "UNaliasing by Fourier-encoding the Overlaps Using the temporaL Dimension" (UNFOLD) is equivalent to sampling k-t-space in a sheared grid pattern. Discrete regular sampling in k-t-space leads to periodic replication of the support region in x-f-space. Thus, the maximum acceleration achievable by UNFOLD is equivalent to the maximum packing of support regions in x-fspace. When the support region is separable along the x and f axes, the reconstruction can be performed separately for each k.

show abstract

Section: Unfold Fmrimentioning

confidence: 99%

On the UNFOLD method

Tsao

2001

Magnetic Resonance in Med

View full text Add to dashboard Cite

show abstract

“…EnKF also chooses a similar sampling pattern, although we assume all the measurements during one time interval as taken at the same time. DIME [7] also uses the same sampling pattern supporting it with gating. Using this secondary measurement data, DIME achieves 6-fold improvement in temporal resolution.…”

Section: Reconstruction Results Of Different Methodsmentioning

confidence: 99%

“…Newer temporal correlation methods such as DIME [7] by Liang et al add a frequency component to the temporal correlation models. This addition helps to compute the missing temporal points much more accurately.…”

Section: Temporal Correlation Methodsmentioning

confidence: 99%

“…However, cardiac motion, like some other bodily motions, has a periodical property which can be modeled and integrated into the method to improve results, which the above methods do not. The DIME method [7] developed by Prof. Liang at the University of Illinois models this motion and integrates it, adding frequency response to temporal correlations. While this motion modeling considerably improves the results, the method includes the solution of a least squares problem of very large matrices.…”

Section: Motivationmentioning

confidence: 99%

“…Later methods include the frequency components of each k-space point, adding the frequency response to the temporal correlation algorithms. Dynamic imaging by model estimation (DIME) by Liang et al [7] and similar methods [18] are being used in this context. Although these methods take the periodical features of the object into account, they require a higher computational power and longer time to reconstruct images.…”

Section: Historymentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Magnetic Resonance Imaging

Erturk¹

Encyclopedia of Diagnostic Imaging

View full text Add to dashboard Cite

We propose a cost-effective algorithm for the dynamic image reconstruction problem in magnetic resonance imaging (MRI). The proposed imaging method, the ensemble Kalman filter, is a Monte Carlo approximation to the Kalman filter with reduced computational cost. The technique reconstructs images of snapshots taken during a cardiac cycle from a low number of measurements that can be obtained during the time interval. The algorithm makes use of a dynamic imaging model of the object derived from prior information. The results are produced by applying the method on the extended cardiac-torso (XCAT) human body phantom with real life parameter selections. The reconstructions are sharp, accurate and fast without any ringing artifacts caused by the conventional methods.

show abstract

Supportive versus palliative care: What's in a name?

Fadul

Elsayem

Palmer

et al. 2009

Cancer

320

118

View full text Add to dashboard Cite

BACKGROUND:Palliative care has been progressively adopted by American cancer centers; however, referrals to palliative care continue to occur late in the trajectory of illness. It was hypothesized that the perceived association between the name palliative care and hospice was a barrier to early patients' referral. The objectives of this study were to determine the perception of the impact of the name palliative care compared with supportive care on patient referral and to determine whether there was an association between demographic factors and the perceptions of the 2 names by medical oncologists and their midlevel providers (advance practice nurses and physician assistants) at a comprehensive cancer center.METHODS:A survey was conducted among a random sample of 100 medical oncologists and 100 midlevel providers from The University of Texas M. D. Anderson Cancer Center. Information was collected on demographics, previous experience in palliative care, and attitudes and beliefs toward the impact of the name palliative care compared with supportive care on patient referral.RESULTS:A total of 140 of 200 (70%) participants responded (74 midlevel providers and 66 medical oncologists). Median age was 43 years (range, 34.5‐50 years), and there were 83 (60%) women. Midlevel providers and medical oncologists generally agreed in their responses to most of the items. More participants preferred the name supportive care (80, 57%) compared with palliative care (27, 19% P < .0001). Medical oncologists and midlevel providers stated increased likelihood to refer patients on active primary (79 vs 45%, P < .0001) and advanced cancer (89 vs 69%, P < .0001) treatments to a service named supportive care. The name palliative care compared with supportive care was perceived more frequently by medical oncologists and midlevel providers as a barrier to referral (23 vs 6% P < .0001), decreasing hope (44 vs 11% P < .0001), and causing distress (33 vs 3% P < .0001) in patients and families. There were no significant associations among the perception of the 2 names and age (P = .82), sex (P = .35), or prior training in palliative care (P > .99).CONCLUSIONS:The name palliative care was perceived by medical oncologists and midlevel providers as more distressing and reducing hope to patients and families. Medical oncologists and midlevel providers significantly prefer the name supportive care and stated more likelihood to refer patients on active primary and advanced cancer treatments to a service named supportive care. Cancer 2009. © 2009 American Cancer Society.

show abstract

Dynamic imaging by model estimation

Cited by 80 publications

References 6 publications

On the UNFOLD method

On the UNFOLD method

Dynamic Magnetic Resonance Imaging

Supportive versus palliative care: What's in a name?

Contact Info

Product

Resources

About