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Feasibility Study of Applying the Acrylic Assistant Equipment (ACR) to Reduce Patient's Discomfort in Lower Abdomen MRI Scan

하복부 MRI 검사 시 환자의 불편함을 줄이기 위한 아크릴 보조 장치 사용의 타당성 조사

  • Park, Eunhye (Department of Radiology, Seoul National University Hospital) ;
  • Lee, Minsik (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine)
  • 박은혜 (서울대학교병원 영상의학과) ;
  • 이민식 (울산대학교 의과대학 서울아산병원 방사선종양학과)
  • Received : 2018.05.30
  • Accepted : 2018.08.31
  • Published : 2018.08.31

Abstract

In lower abdominal MRI scan, patients have been tested by physically contacting with the body array coil. In this study, we have designed the acrylic assistant equipment (ACR) which allows the contactless scan of the patient to the coil and evaluated the feasibility by comparing the acquired images with ACR to those obtained without ACR. We tested 10 cases (F: 5, m: 5) by using the Ingenia $3.0T^{TM}$ MR system and dStreamTM torso coil (Philips Healthcare, Netherlands). We implemented T1 AX TSE and eTHRIVE (GRE) techniques. The scanned images were quantitatively and qualitatively assessed. In qualitatively, the TSE shows 4.44 and 4.56 mean values with and without the ACR and 4.34 and 4.28 at the GRE, respectively. In quantitatively, the TSE shows 12.15 CNR, 17.95 SNR and 12.71 CNR, 18.96 SNR with and without the ACR. And GRE shows 17.72 CNR, 22.59 SNR and 18.26 CNR, 24.47 SNR with and without the ACR, respectively. We have designed and implemented the acrylic assistant equipment to lower abdominal patients. Our data indicate that it is possible to obtain similar image qualities to current lower abdominal MRI scan without the physical contact to the patient.

하복부 MRI 검사에서 환자는 body array coil과 물리적으로 접촉하여 검사를 받는다. 이 연구에서는 아크릴 보조장치(ACR)를 설계하여 코일과 환자의 비접촉식 스캔을 가능하게하고, ACR을 이용해서 획득 한 영상을 ACR 없이 얻은 영상와 비교하여 실현 가능성을 평가하였다. Ingenia 3.0TTM MR 시스템과 dStreamTM torso coil (Philips Healthcare, Netherlands)을 사용하여 10건(F : 5, m : 5)을 테스트하였다. 대표적인 두가지 pulse sequence(T1 AXE TSE, eTHRIVE (GRE))를 사용하여, 스캔 한 영상을 정량적, 정성적으로 비교 분석 하였다. 정성적으로 보면, TSE는 ACR의 유무에 관계없이 4.44와 4.56의 평균값을, GRE에서는 각각 4.34와 4.28을 보여준다. 정량적으로, TSE는 ACR 유무에 관계없이 12.15 CNR, 17.95 SNR 및 12.71 CNR, 18.96 SNR을 보였으며, GRE는 ACR이 있는 경우와 없는 경우 각각 17.72 CNR, 22.59 SNR 및 18.26 CNR, 24.47 SNR을 보여주었다. 즉, ACR의 사용이 환자를 편안하게 하지만, 화질에는 큰 영향이 없음을 확인하였다. 우리는 하복부 환자의 MRI 검사용 아크릴 보조 장치를 설계하고 적용해보았다. 우리의 결과는 환자와의 물리적 접촉없이 현재의 복부 MRI 스캔과 유사한 이미지 품질을 얻을 수 있음을 보여주었다.

Keywords

References

  1. V. R. Fuchs, H. C. Sox Jr, "Physicians' views of the relative importance of thirty medical innovations," Health Affairs (Millwood), Vol. 20, No. 5, pp. 30-42, 2001. https://doi.org/10.1377/hlthaff.20.5.30
  2. V. Hartwig, G. Giovannetti, N. Vanello, M. Lombardi, L. Landini, S. Simi, "Biological effects and safety in magnetic resonance imaging: a review," International Journal of Environmental Research and Public Health, Vol. 6, No. 6, pp. 1778-1798, 2009. https://doi.org/10.3390/ijerph6061778
  3. J. Estelrich, M. J. Sanchez-Martin, M. A. Busquets, "Nanoparticles in magnetic resonance imaging: from simple to dual contrast agents," International Journal of Nanomedicine, Vol. 10, pp. 1727-1741, 2015.
  4. H. K. McIsaac, D. S. Thordarson, R. Shafran, S. Rachman, G. Poole, "Claustrophobia and the magnetic resonance imaging procedure," Journal of Behavioral Medicine, Vol. 21, No. 3, pp. 255-268, 1998. https://doi.org/10.1023/A:1018717016680
  5. J. Enders, E. Zimmermann, M. Rief, P. Martus, R. Klingebiel, P. Asbach, C. Klessen, G. Diederichs, M. Wagner,U. Teichgraber, T. Bengner, B. Hamm, M. Dewey, "Reduction of Claustrophobia with Short-Bore versus Open Magnetic Resonance Imaging: A Randomized Controlled Trial," PLOS ONE, Vol. 6, No. 8-e23494, 2011. https://doi.org/10.1371/journal.pone.0023494
  6. A. D. M. Haddad, B. Platt, A. C. James, J. Y. F. Lau, "Anxious and non-anxious adolescents' experiences of non-clinical magnetic resonance imaging research," Child Psychiatry and Human Development, Vol. 44, No. 4, pp. 556-560, 2013. https://doi.org/10.1007/s10578-012-0350-x
  7. S. Vujmilovic, S. Vujnovic, V. K. Dragosavljevi c, Z. Vujkovic, D. Katana, D. Vujmilovic, "Patient's comfort and Technical Quality Exams at 1.5 and 3.0 T Magnetic Resonance Imaging," Open Journal of Radiology, Vol. 6, No. 4, pp. 264-274, 2016. https://doi.org/10.4236/ojrad.2016.64035
  8. O. Dietrich, J. G. Raya, S. B. Reeder, M. F. Reiser, S. O. Schoenberg, "Measurement of signal-to-noise ratios in MR images: influence of multichannel coils, parallel imaging, and reconstruction filters," Journal of Magnetic Resonance Imaging, Vol. 26, No. 2, pp. 375-385, 2007. https://doi.org/10.1002/jmri.20969
  9. A. Herman, R. Maymon, E. Dreazen, E. Caspi, I. Bukovsky, Z. Weinraub, "Nuchal translucency audit: a novel image-scoring method," Ultrasound in Obstetrics & Gynecology, Vol. 12, No. 6, pp. 398-403, 1998. https://doi.org/10.1046/j.1469-0705.1998.12060398.x
  10. M. T. D. Palo, "Rating satisfaction research: is it poor, fair, good, very good, or excellent?," Arthritis Care & Research, Vol. 10, No. 6, pp. 422-430, 1997. https://doi.org/10.1002/art.1790100610