JPEG2000 is a new standard for image compression, Ultrasonic echo image is one of medical images modality which is based on Wavelet Transform and incorporated into and the features are significantly different from ones of natural DICOM (Digital Imaging and Communication in Medicine)-In image and quite different from other medical images. Thus, JPEG2000, there are two quantization methods, the scalar the image quality is measured by using PSNR, which does not derived quantization (SDQ) and the scalar expounded correlate well with subjective assessment [10]. PSNR is high quantization (SEQ). In this work, we use three optimization but compressed image could not be used for diagnostic. methods of quantization step, which are SDQ, SEQ determined by out previ ous wotwe used thr methodstic arithmetic average method and SEQ determined by genetic Also in our previous work, we compared three methods of algorithm. Evaluation of image quality is comparison between quantization step to improve image quality and compression Peak Signal to Noise Ratio (PSNR) and standard deviation, which rate for medical ultrasonic echo image in JPEG2000. Three one is correlation with the results of subjective assessment. PSNR optimization methods of quantization step are SDQ, SEQ is is traditional objective assessment to measure image quality and determined by Arithmetic Average Method and SEQ is standard deviation is new criterion. Subjective assessment is determined by Genetic Algorithm. SEQ by Genetic Algorithm evaluated by ultrasonographers, which is the most important for shows better result for medical ultrasonic echo image. medical image. The results show that standard deviation match to Although, PSNR value iS lower but the compressed image subjective assessment. Sometime compressed image loses which is evaluated by ultrasonographers keep important important information for diagnosis in spite of high PSNR. Therefore, PSNR does not correlate well with the results of information for diagnosis. subjective assessment. Our purpose is to use the new criterion Therefore, our motivation attempted to find the new instead of PSNR that standard deviation is better than PSNR.criterion instead of PSNR for medical ultrasonic echo image. New criterion has to correlate well with the results of I.INTRODUCTION subjective assessment. A pulse echo ultrasonic image is not quantitative. Gray JPEG2000 is able to offer higher compression ratios for level value is not so important. Therefore, the lossy compression and it is applied to numerous images [1], [2] ultrasonographers see only the shape of object and brightness. and [3]. Recently, JPEG2000 is incorporated into DICOM [4].Therefore, how to keep the profile of gray level information is There are two quantization methods. One is the Scalar so important. If the standard deviation of compressed image Derived Quantization (SDQ), which is usually used in closes to standard deviation of original image as much as JPEG2000 software. The other is the Scalar Expounded possible in order to make them more high compr...

Image quality plays an important role in various images processing. For ultrasonic echo image, image quality is evaluated by Standard Deviation and ultrasonographers in Tokai hospital. This paper is to find the image quality criterion using Standard Deviation. The image is separated in the block pixel such as 16x16, 32x32, 64x64, 128x128 and block pixel calculate Standard Deviation. The results show that the value is more than 6.92 the image can be used for diagnosis. The image quality criterion is suitable for abdomen part of ultrasonic echo image.

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