我們使用一階高溫超導rf-SQUID梯度計在磁屏蔽屋裡測量生物的心磁訊號，一階梯度計是由兩個高溫rf-SQUID所組成，待測者有人體與兔子，人體分別為健康者與心律不整者，兔子分別為健康兔子與高血脂兔子。
以往實驗室對於心磁數據處理方式只有透過平均處理來降低雜，提高訊雜比，但若要處理心律不整者的心磁信號時，由於心磁信號週期長短不一，平均處理後有可能會使原本的信號失真變形，使判讀時失去心磁訊號的正確性。因此，量測心律不整者時，必須不必透過平均處理，最好能夠直接讀取及時的心磁信號，在一般情況下，及時所量得的信號裡所包含的雜訊，會使得信號與雜訊分辦不清，難以從及時的心磁圖中判別病症，因此我們才利用奇異值分解法(Singular Value decomposition, SVD)來消除及時信號中的雜訊。
由於心磁訊號有類似週期特性，奇異值分解法是將訊號分成單位向量與相對大小權重之線性組合，可將心磁信號中重要的生理特徵從原始波形中解離出來，將其他殘餘的背景雜訊以及微小訊號的分量去除，進而能消除雜訊，改善訊雜比。
人體與兔子的心磁信號經過奇異值分解法處理後，訊雜比分別可提高四倍與兩倍。但經過奇異值分解法再經平均處理的心磁圖，與未經過奇異值分解法處理直接平均處理後的心磁圖相比，並無明顯的差異，從平均結果比較後的結論是若想要得到平均後的心磁圖，可以不須經過奇異值分解法而直接作平均處理；若想要得到及時的心磁圖，便可以利用奇異值分解法作處理。

[1]李國棟,”生物磁學及其應用,”科學出版社, 北京, 1983.
[2] Baule R. M., McFee R, Am. Heart J. 55, 95 (1963)
[3] D. Cohen, E. A. Edelsack, and J. E. Zimmerman, Appl. Phys. Lett. 16,278 (1970)
[4] J. E. Zimmerman and N. V. Frederick, Appl. Phys. Lett. 9,16 (1971)
[5] Y. Tavrin, Y. Zhang, M. Muck, A. I. Braginski, and C. Heiden, Appl. Phys. Lett. 62,1824 (1993)
[6] Y. Tavrin, Y. Zhang, M. Muck, A. I. Braginski, and C. Heiden, IEEE Trans. Appl. Supercond. 3, 2477 (1993)
[7] H.C. Yang, S. Y. Wang, J. T. Jeng, H. E Horng, “Off-axis second order HTS rf SQUID gradiometer for magnetocardiography”, IEEE Trans. Appl. Supercon. 13, 360-363 (2003).
[8] P. P. Kanjilal, S. Palit, “On multiple pattern extraction using singular value decomposition,” IEEE Trans. Signal process, 43, 1536, (1995)
[9] Michael E. Wall, Andreas Rechtsteiner, Luis M. Rocha, “Singular value decomposition and principal component analysis,” A Practical approach to Microarray Data Analysis, chapter 5, (2003)
[10] P. P. Kanjilal and S. Palit, “The singular value decomposition – Applied in the modeling and prediction of quasiperiodic processes,” Signal Processing, 35, 257 (1994)
[11] B. Acar and H. Koymen, “SVD-based on-line exercise ECG signal orthogonalization,” IEEE Trans. Biomed. Eng, 46, 311 (1999)
[12] D. Callaerts, W. sansen, J. Vandewalle, G Vantrappen and J Janssens, “Description of a real-time system to extract the fetal electrocardiogram,” Clin. Phys. Phesiol. Mess, 10, Suppl. B, 7-10 (1989)
[13] 程雋, “應用線性代數,” 文笙書局, (2003)
[14] 魏志中, “SVD Based Pattern Analysis for Quasiperiodic Signal Processing -- ECG Data Compression and Noise Reduction,” 國立台灣大學電機所博士論文, (2001)
[15] Arthur C. Guyton and John E. Hall, “蓋統生理學,” 華杏出版社, (1998)
[16] J. Clarke, “In SQUID Sensors：Fundamentals, Fabrication and Applications,” NATO ASI series, edited by H. Weinstock (Kluwer Academic, Dordrecht), 1 (1996)
[17] C. Poole, H. Farach, and R. Creswick, "Superconductivity," Chap. 13, Academic Press, San Diego, (1995)
[18] Y. Zhang, G. panaitov, S. G. Wang, N. Wolters, R. Otto, J.schubert, W. Zander, H. J.
Krause, H. Soltner, H. Bousack, and A. I. Braginski, Appl. Phys. Lett., 76, (1997)
[19] H. E. Horng, S. Y. Hung, J. T. Jeng, S. H. Liao, S. C.. Hsu, J. C. Hwang, H. C. Yang, “ Biomagnetic measurements with HTS SQUID magnetometers in moderate shielded environments”, IEEE Trans. Appl. Supercond. 13,381-384 (2003).
[20] G. Strang, “Linear algebra and applications,” HBJ, USA (1988)
[21] Carl D. Meyer, “Matrix analysis and applied linear algebra,” Siam, Philadelphia, (2000)
[22] David C. Lay, “Linear algebra and its applications,” Addison-Wesley, USA (1997)
[23] J. J. Wei, “ECG Data Compression Using Truncated Singular Value Decomposition,” IEEE Trans. Info. Tech. Biomed., 5, 4, (2001)