Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Usefulness analysis of radial non-cartesian trajectory in the high-resolution MRA

고해상도 MRA 시 방사형 비직각좌표계 k-space 주사방식의 유용성 분석

  • 이호범 (서울아산병원 영상의학과) ;
  • 최관우 (서울아산병원 영상의학과) ;
  • 손순룡 (서울아산병원 영상의학과)
  • Received : 2013.08.29
  • Accepted : 2013.12.05
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

With the application of k-space trajectory in a different manner and analyzing the influence of noise and its direction, this study was conducted to obtain high-quality images with minimal influence of noise during an MRI examination for cerebrovascular disease, which has a low signal for imaging. To evaluate influence of the noise of different k-space trajectories, a linear Cartesian coordination trajectory and non-Cartesian coordination trajectory were applied to 38 people who had received a high-resolution MRI examination for the early detection of cerebrovascular disease. As a result, the non-Cartesian coordination trajectory showed a 43.32% lower signal of lumens in the internal carotid artery than a linear Cartesian coordination trajectory, and the noise level was also 50.19% lower in a non-Cartesian coordination trajectory. This result shows that noise occurs less in a non-Cartesian coordination trajectory than a linear Cartesian coordination trajectory, and a non-Cartesian coordination trajectory is more effective in low-signal and low-resolution MRI examination. Therefore, when performing high-resolution MRI examination with a low-signal cerebrovascular system, the use of non-Cartesian coordination k-space trajectory will minimize the influence of noise and provide good images.

본 연구는 k-space 주사방식을 새롭게 적용하여 noise의 영향과 방향성을 분석함으로써 영상의 신호강도가 낮은 뇌혈관 질환의 고해상도 MRI 검사 시 noise의 영향을 최소화 하여 진단적 가치가 높은 영상을 획득하고자 하였다. 연구방법은 2013년 6월부터 동년7월까지 뇌혈관 질환의 조기 진단을 위해 고해상도 MRI 검사를 받은 38명을 대상으로 k-space 주사방식에 따른 noise의 영향을 평가하기 위해 기존의 선형 직각좌표계 주사방식과 새로운 방사형 직각좌표계 주사방식을 각각 적용한 후, 획득한 영상에서 내경동맥 내강의 신호강도와 noise를 비교 평가하였다. 연구결과, k-space 주사방식에 따른 내경동맥 내강의 신호강도는 방사형 비직각좌표계 주사방식이 기존의 선형 직각좌표계 주사방식 보다 43.32% 낮았고, noise 역시 50.19% 가량 낮게 나타났다. 이는 방사형 비직각좌표계 주사방식이 선형 직각좌표계 주사방식보다 noise가 적게 발생하며, 영상의 신호강도가 낮은 고해상도 MRI에서는 방사형 비직각좌표계 주사방식이 더 유용하다는 것을 의미한다. 그러므로 영상의 신호강도가 낮은 고해상도 뇌혈관 MRI 검사 시 방사형 비직각좌표계 k-space 주사방식을 이용한다면 noise의 영향을 최소화하여 양질의 영상을 획득할 수 있으리라 사료된다.

Keywords

References

  1. Statistics Korea, Available From: http://kostat.go.kr/portal/korea/kor_nw/2/6/2/index.board? bmode=read&bSeq=&aSeq=260046&pageNo=1&rowNu m=10&navCount=10&currPg=&sTarget=title&sTxt=, (accessed Jul., 12, 2013)
  2. D. K. Lee, Y. J. Kwon, S. M. Lee, J. Y. Yang, C. S. Choi, M. B. Ju, "MR Angiographic Findings in Ischemic Stroke patients with Extracranial Caretid Artery Stenosis", J Korean Neurosurg Soc, 33, pp.353-357, 2003.
  3. Y. S. Ji, B. J. Lee, "Usefulness of 3-Dimensional Gadolinium-enjancde MR Angiography for the Evaluation of Pedal Artery: Comparison with digital subtraction angiography", J Korean Radiol Soc, 47, pp. 21-26, 2002. https://doi.org/10.3348/jkrs.2002.47.1.21
  4. Y. H. Kim, "Usefulness of Magnetic Resonance Angiography in Intracranial Arteriovenous Malformation", J Korean Radiol Soc, 30, pp. 7-14, 1994. https://doi.org/10.3348/jkrs.1994.30.1.7
  5. B. J. Park, M. G. Kim, S. I. Suh, S. J. Hong, K. R. Cho, B. K. Seo, K. Y. Lee, N. J. Lee, J. H. Kim, "The Usefulness of Test Bolus Examination in Three Dimensional Contrast Enhanced MR Angiography of the Carotid Artery", J Korean Soc Magn Reson Med, 44, pp. 317-323, 2001. https://doi.org/10.3348/jkrs.2001.44.3.317
  6. Tobias S, Jose G, Clemens C, Katja B, Georgios M, Olaf D, Dirk A, Ute F, Chun Y, Thomas S, Abd W, Maximilian F, Konstantin N, "High resolution carotid black-blood 3T MR with parallel imaging and dedicated 4-channel surface coils", J Cardiovasc Magn Reson, pp.1-12, 2009. DOI: http://dx.doi.org/10.1186/1532-429X-11-41
  7. Tan H, Mever CH, "Estimation of k-space trajectories in spiral MRI", Magn Reson Med, 61, pp.396-404, 2009 DOI: http://dx.doi.org/10.1002/mrm.21813
  8. S. K. Park, C. B. Ahn, D. G. Sim, H. C. Park, "Study of Motion Effects in Cartesian and Spiral Parallel MRI Using Computer Simulation", J Korean Soc Magn Reson Med, v.12, no.2, pp.123-130, 2008.
  9. K. W. Choi, S. L. Son, H. J. Lee, T. H. Kim, M. S. Han, J. H. Min, "Usefulness of contrast agent involving high gadolium content for myocardial viability assessment", Journal of academia-industrial technology DOI: http://dx.doi.org/10.5762/KAIS.2013.14.3.1294
  10. Morita A, Kirino T, Hashi K, Aoki N, Fukuhara S, Hashimoto N, Nakayama T, Sakai M, Teramoto A, Tominari S, Yoshimoto T, " The natural course of unruptured cerebral aneurysms in a Japanese cohort", N Engl J Med. pp.2474-82, 2012
  11. Rasche V, Holz D, "radial turbo spin echo imaging", Magn Reson Med, v.32, no.5, pp.629, 1994. DOI: http://dx.doi.org/10.1002/mrm.1910320512
  12. Heid O, "Robust EPI Phase Correction", Magn Reson Med, p.2014, 1997.
  13. Okuchi S, Okada T, Ihara M, "Visualization of Lenticulostriate Arteries by Flow-Sensitive Black-Blood MR Angiography on a 1.5T MRI System: A Comparative Study between Subjects with and without Stroke", AJNR Am J Neuroradiol, v.34, no.4, pp.780-784, 2013. DOI: http://dx.doi.org/10.3174/ajnr.A3310
  14. S. K. Park, C. B. Ahn, D. G. Sim, H. C. Park, "Study of motion effects in cartesian and spiral paralle mri using computer simulation", J Korean Soc Magn Reson Med, v.12, no.2, pp.123-130, 2
  15. Altbach MI, Outwater EK, Trouard TP, Krupinski EA, Theilmann RJ, Stopeck AT, Kono M, Gmitro AF, "Radial fast spin-echo method for T2-weighted imaging and T2 mapping of the liver", J Magn Reson Imaging, v.16, no.2, pp.179-189, 2002. DOI: http://dx.doi.org/10.1002/jmri.10142
  16. B. Paul, P. Andrew, M. Kai, "MRI of the coronary vessel wall at 3T: comparison of radial and cartesian k-space sampling", AJR Am J Roentgenol, v.188, no.1, pp.70-74, 2007. DOI: http://dx.doi.org/10.2214/AJR.06.0266