There have been only a few large-scale nationwide studies regarding the frequency of eating a balanced diet consisting of staple food, the main dish, and side dishes in Japan. Therefore, this study aimed to clarify factors affecting the frequency of eating a balanced meal that consists of staple food, the main dish, and side dishes twice a day. We analyzed the secondary data of 13,772 responses from the 7-year pooled cross-sectional data of the nationwide Surveys of Attitudes toward Shokuiku (Food and Nutrition Education) by the Cabinet Office and the Ministry of Agriculture, Forestry and Fisheries of Japan. Ordered logit regression was used to find factors affecting the frequency of having a balanced diet. Our estimation results suggested that gender, age, cohabitation, eating meals with family, subjective economic status, and residential area could be factors affecting the probability of having balanced meals every day. In conclusion, single men in their 20s-50s, single men in their 80s, older male adults living but not eating together with family, single women in their 20s-30s, and individuals with low economic status were identified as high-risk groups who do not have a balanced diet in Japan. Moreover, we found that the government health promotion program called Kenko Nippon 2013 (Health Japan 21, the second term) did not improve the dietary behavior of the consumer in Japan.

The observer performance tests of two processing systems were also canied out ． According to the imaging preperties ， the 45・ sec processing system was inferior to the 90 sec processing systern ［ n contrast and MTF ． The results of the observer performance tests using a RMI − 156 phantom also indicated that the 45 − sec precessing system was inferior to the 90 ・ sec processing system ． Qne Qf the main reasQns why the 45 ・ sec pr essing system was worse 、 is thought to be し hat tbe 45 − sec prQcessing canbe obtained sufflcient filrn con し rast and film speed ，

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To compare the diagnostic quality of mammographs obtaincd with a computed radiographic (CR)system with that obtained with scrccn − film sys 亡 ems ， an observer perfQrmance test， using phantQm images， was carried out ． The CR system tends to be superior in dctectability of microcalcifications ， rnasses and spicules to the (1872) ． 一 ．

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