Compact storage of medical images with patient information

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Compact storage of medical images with patient information A. U. Rajendra, D. Acharya, B.

Compact storage of medical images with patient information A. U. Rajendra, D. Acharya, B. P. Subbanna, and U. C. Niranjan, IEEE Transactions on Information Technology in Biomedicine, Vol. 5, No. 4 , Dec. 2001, pp. 320 -323. Advisor ：Dr. Chang, Chin-Chen Reporter： Jian, Yong-Xin Date ： 2003/3/11

Outline Introduction l Proposed scheme for storage l Encryption of the Text File l

Outline Introduction l Proposed scheme for storage l Encryption of the Text File l Encryption of the Heart Rate Signal Graph l Experimental results l Conclusions l

Introduction This technique is adapted here for interleaving patient information with medical images to

Introduction This technique is adapted here for interleaving patient information with medical images to reduce storage and transmission overheads. l The text data are encrypted before interleaving with images to ensure greater security. l The graphical signals are compressed and subsequently interleaved with the image. l

Proposed scheme for storage Document/ Graphical file Encryption Interleaved image nxn Image

Proposed scheme for storage Document/ Graphical file Encryption Interleaved image nxn Image

Encryption of the Text File Encryption of patient information. (a) Original patient information. (b)

Encryption of the Text File Encryption of patient information. (a) Original patient information. (b) Encrypted patient information.

Encryption of the Text File (cont. ) l Encryption: Te = (Log (To *

Encryption of the Text File (cont. ) l Encryption: Te = (Log (To * 2) *100 ) - 300 Te = the encrypted text To = the ASCII code of the original text l Decryption: To = exp{ (Te + 300)/100 – log(2)}

Encryption of the Heart Rate Signal Graph 左圖: DPCM (a) Original signal. (b) Reconstructed

Encryption of the Heart Rate Signal Graph 左圖: DPCM (a) Original signal. (b) Reconstructed signal. (c) Error signal. 右圖: ADM (a) Original signal. (b) Reconstructed signal. (c) Error signal.

Experimental results Result of interleaving text in the MRI image. (a) Original image. (b)

Experimental results Result of interleaving text in the MRI image. (a) Original image. (b) Interleaved image.

Experimental results (cont. ) Result of interleaving ADM error signal in the ultrasound image.

Experimental results (cont. ) Result of interleaving ADM error signal in the ultrasound image. (a) Original image. (b) Interleaved image.

Experimental results (cont. ) Result of interleaving DPCM error signal in the angiogram image.

Experimental results (cont. ) Result of interleaving DPCM error signal in the angiogram image. (a) Original signal. (b) Interleaved signal.

Experimental results (cont. ) NRMSE% & MNRMSE%

Experimental results (cont. ) NRMSE% & MNRMSE%

Conclusions l A technique of interleaving patient information (text documents , physiological signals) with

Conclusions l A technique of interleaving patient information (text documents , physiological signals) with medical images for efficient storage. l l l Text files---logarithmic technology Heart-rate signals---DPCM and ADM NRMSE was found to be less than 0. 71% for 8 bit encoded pixel intensity.

NRMSE% N =the total number of columns , M =the total number of rows

NRMSE% N =the total number of columns , M =the total number of rows in the image, f (x; y) = the original pixel intensity, and fw (x; y) =the modified (interleaved) pixel intensity.