This paper proposes a multifunctional fitness monitor based on FFT and photoelectric sensor, which uses pulse-type and non-invasive detection method to complete the analysis of the human blood oxygen saturation and heart rate. The system collects the absorption of red and infrared light absorbed by fingertip, then by programmable gain amplifier and the Fast Fourier analysis, it extracts the amplitude, frequency of the AC signal. PIC24FJ128GA010 is used to complete the collection, automatic gain judgment and signal processing. Finally, the result is calibrated by pulse blood oxygen emulator. Furthermore, it realizes the pedometer function based on three axles acceleration sensors MMA7260, which enhances fitness monitor's usability and allows people to obtain dynamic physiological signs when exercising.
Equipment Design ; Fourier Analysis ; Humans ; Monitoring, Physiologic ; instrumentation ; Oximetry ; instrumentation ; methods

Objective To investigate the prognostic value of pretreatment 18F-fluorodeoxyglucose (FDG) PET/CT imaging on extranodal nasal type natural killer/T-cell lymphoma (ENKTL).Methods Thirtyfive patients (20 males,15 females,average age 45 years) diagnosed as Ann Arbor stage Ⅰ-Ⅱ ENKTL from February 2013 to February 2016 were retrospectively analyzed.All patients were pathologically confirmed and underwent 18F-FDG PET/CT before treatment.The maximum standardized uptake value (SUVmax),international prognostic index score (IPI),serum lactate dehydrogenase (LDH),and immunohistochemical results were recorded.Patients were followed up for 2 years.The relationships between SUVmax,progression-free survival (PFS),pathological features and IPI were assessed using Fisher exact test.Results There were 18 ENKTL patients with progression,and 17 had no progression.Patients with SUVmax ≥ 12.2 had worse prognosis than those with SUVmax＜ 12.2 (P =0.001).There were correlations between SUVmax and Ki-67 (r=0.701,P=0.001),SUVmax and CD56 (r=0.393,P=0.032),SUVmax and IPI (r=0.787,P＜0.01),respectively.It was also found that SUVmax,Ki-67,CD56 and IPI were related to PFS (all P＜0.05).Conclusion SUVmax of 18F-FDG could be used as an important prognostic indicator for early ENKTL.