MSCT is one of the modalities to diagnose kidney function. Urinary tract examination or by using tracking reconstruction without using positive contrast media is able to produce urinary tract images and use tracking able to identify urinary tract images with urolithiasis. The need for an appropriate ASIR setting value in the MSCT plane parameters, To prove differences in image quality and identify which ASIR is best for MSCT too knowing the optimal image between using tracking and CT Urography examination using contrast. This experimental study with the PostTest Only Group Design study design, the number of samples used was 5 groups. The results of MSCT image showed that there was a significant difference in the value of < 0,001 (p <0.05) with the mean value for each ASIR as follows 20 mean value 3.40, ASIR 40 mean value 7.90, ASIR 60 mean value 12.70, ASIR 80 mean value 18.00, ASIR 100 mean value 23.00. The results of the MSCT urinary tract analysis after the ASIR test showed that there were significant differences between ASIR. Conclusion optimal image results using tracking by The mean value is ASIR 100 the rank of 23.00 and CT Urography using positive contrast media of 8.00.

Backgroud: Kidney disease is a clinical situation which is indicated by the decreasing of kidney functions and MSCT is one of the modalities to diagnose that function. Aim to identify the differences in image information with filter variation abdomen medium smooth and Mediastinum Standard. Methods: The method was the experimental research using research planning Post Test Only Group Design. The sampling was chosen consecutively. There were 3 Radiolog and 32 citra on the examination of MSCT abdomen without positive contrast media in Salatiga Public Hospital. Results :The intervention validity experiment after a tracking filter with variations, kruskal Wallis test results. There are meaningful differences shows vlue of p value 0,000 (p<0,05), so that continued analysis of the Mann Whitney. The results of the analysis of the Mann Whitney pointed out that there is a difference between real or significant group of filter Medium Smooth Abdomen with Abdominal filter Medium Sharp/Mediastinum Standard Sig<0.05 p value 0.000). Conclusion: a variation of the filter is able to identify the existence of a difference image information tracktus optimal unirarius MSCT abdomen after tracking by using the best filtr Medium Sharp Abdomen/Mediastinum Standard.