Urinary stone composition analysis of 3684 patients in the eastern Shandong region of China

Objective To explore the composition of urinary stones in the eastern Shandong region of China and discuss its clinical significance. Methods A total of 3684 specimens of urinary calculi from the eastern Shandong region were collected in our study. Compositions of stones were analyzed by Automatic Infrared Spectrum Analysis System (type LIIR-20). The results were verified through manual analysis of the spectrogram which is accompanied by polarizing microscopy and chemical analysis if necessary. Results Among the 3684 specimens, there were 1767 single-component stones and 1917 mixed-component stones. According to the difference of the main components of the stones, the stones can be divided into the following types: calcium oxalate monohydrate stones (1779, 48.29%), anhydrous uric acid stones (1105, 29.99%), carbonate apatite stones (590, 16.02%), ammonium magnesium phosphate hexahydrate stones (143, 3.88%), calcium oxalate dehydrate stones (36, 0.98%), and cystine stones (31, 0.84%). Conclusion There are relatively many uric acid stones in the eastern Shandong region of China. The automatic infrared spectrum analysis system for calculus has the advantages of accuracy and convenience.

The Design of Spectrum Analysis System on Ultrasonic Based on DSP

The spectrum analysis system, which is based on TMS320F2808, can detect ultrasonic signal in real time. The signal is transformed from time domain to frequency domain by use of FFT. The spectrum graph can be displayed on LCD in real time. The practical results illustrated that this system can analyze the frequency spectrum efficiently with the range of 30kHz~50kHz.