PMID- 32785807
OWN - NLM
STAT- MEDLINE
DCOM- 20210916
LR  - 20210916
IS  - 1352-8661 (Electronic)
IS  - 0968-5243 (Linking)
VI  - 34
IP  - 3
DP  - 2021 Jun
TI  - OPERA: a novel method to reduce ghost and aliasing artifacts.
PG  - 451-467
LID - 10.1007/s10334-020-00881-1 [doi]
AB  - OBJECTIVE: A method for Orthogonal Phase Encoding Reduction of Artifact (OPERA) 
      was developed and tested. MATERIALS AND METHODS: Because the position of ghosts 
      and aliasing artifacts is predictable along columns or rows, OPERA combines the 
      intensity values of two images acquired using the same parameters, but with 
      swapped phase-encoding directions, to correct the artifacts. Simulations and 
      phantom experiments were conducted to define the efficacy, robustness, and 
      reproducibility. Clinical validation was performed on a total of 1003 images by 
      comparing the OPERA-corrected images and the corresponding image standard in 
      terms of Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR). The 
      method efficacy was also rated using a Likert-type scale response by two 
      experienced independent radiologists using a single-blinded procedure. RESULTS: 
      Simulations and phantom experiments demonstrated the robustness and effectiveness 
      of OPERA in reducing artifacts strength. OPERA application did not significantly 
      change the SNR [+ 4.16%; inter-quartile range (IQR): 2.72-5.01%] and CNR 
      (+ 4.30%; IQR: 2.86-6.04%) values. The two radiologists observed a total of 893 
      original images with artifacts (89.03% of the total images), a reduction in the 
      perceived artifacts of 82.0% and 83.9% (p < 0.0001), and an improvement in the 
      perceived SNR (82.8% and 88.5%; K = 0.714) and perceived CNR (86.9-88.9%; 
      K = 0.722). DISCUSSION: The study demonstrated that OPERA reduces MR artifacts 
      and improves the perceived image quality.
FAU - Dell'Orso, Andrea
AU  - Dell'Orso A
AUID- ORCID: 0000-0001-7135-3442
AD  - Department of Radiology, San Giuseppe Hospital, Empoli AO Toscana Centro, Viale 
      Boccaccio 14, Florence, Italy. dellorsoandrea@gmail.com.
FAU - Positano, Vincenzo
AU  - Positano V
AD  - Fondazione G. Monasterio CNR - Regione Toscana, Pisa, Italy.
FAU - Arisi, Giovanni
AU  - Arisi G
AD  - Blue Soft Software Solutions, Poggibonsi, Italy.
FAU - d'Errico, Francesco
AU  - d'Errico F
AD  - Universita di Pisa, Scuola di Ingegneria, Pisa, Italy.
AD  - School of Medicine, Yale University, New Haven, CT, USA.
FAU - Taddei, Aldo
AU  - Taddei A
AD  - Clinical Department of Radiology, AO Toscana SUD-EST, Poggibonsi General 
      Hospital, Poggibonsi, Italy.
FAU - Banchi, Benedetta
AU  - Banchi B
AD  - Department of Radiology, University of Siena, Siena, Italy.
FAU - De Felice, Claudio
AU  - De Felice C
AD  - AOUS, Neonatal Intensive Care Unit, S.M. Alle Scotte General Hospital, Siena, 
      Italy.
LA  - eng
PT  - Journal Article
DEP - 20200812
PL  - Germany
TA  - MAGMA
JT  - Magma (New York, N.Y.)
JID - 9310752
SB  - IM
MH  - *Artifacts
MH  - Phantoms, Imaging
MH  - Reproducibility of Results
MH  - Signal-To-Noise Ratio
OTO - NOTNLM
OT  - Aliasing
OT  - Ghost artifact
OT  - Image quality
OT  - MRI
OT  - Phase-encoding direction
EDAT- 2020/08/14 06:00
MHDA- 2021/09/18 06:00
CRDT- 2020/08/14 06:00
PHST- 2020/04/21 00:00 [received]
PHST- 2020/08/03 00:00 [accepted]
PHST- 2020/06/29 00:00 [revised]
PHST- 2020/08/14 06:00 [pubmed]
PHST- 2021/09/18 06:00 [medline]
PHST- 2020/08/14 06:00 [entrez]
AID - 10.1007/s10334-020-00881-1 [pii]
AID - 10.1007/s10334-020-00881-1 [doi]
PST - ppublish
SO  - MAGMA. 2021 Jun;34(3):451-467. doi: 10.1007/s10334-020-00881-1. Epub 2020 Aug 12.