Method, medical system, and computer readable medium

A medical system comprising:

• a photoplethysmographic sensor attachable to a body of a patient, and configured to emit light toward the body, and convert the light reflected by or passing through the body and received for a particular period into a voltage signal indicating variation of voltage in the period;
• and
• an information processing apparatus comprising:
• an interface circuit connectable to the sensor,
• a memory, and
• a processor configured to:
• acquire the voltage signal from the sensor through the interface circuit,
• calculate one or more scores for each of one or more portions of the voltage signal using voltage values thereof,
• generate data corresponding to one of the portions, the one or more scores of which satisfy a predetermined condition, and
• store in the memory the generated data as photoplethysmographic data suitable for medical measurement, wherein
• the one or more scores include a second score representing periodicity of a waveform in each portion of the voltage signal, and
• the processor is further configured to:
• determine an envelope curve of each portion of the voltage signal, and
• perform an autocorrelation analysis on waveform data obtained by dividing the voltage values of each portion of the voltage signal by voltage values of the envelope curve.

A non-transitory computer readable medium storing a program causing a computer to execute a method for obtaining photoplethysmographic data suitable for medical measurement, the method comprising:

• emitting light from a photoplethysmographic sensor toward a body of a patient, and converting the light reflected by or passing through the body and received by the sensor for a particular period into a voltage signal indicating variation of voltage in the period;
• calculating one or more scores for each of one or more portions of the voltage signal using voltage values thereof;
• generating data corresponding to one of the portions, the one or more scores of which satisfy a predetermined condition;
• and
• storing, in a memory of the computer, the generated data as the photoplethysmographic data suitable for the medical measurement, wherein
• the one or more scores include a second score representing periodicity of a waveform in each portion of the voltage signal, and
• calculating includes determining an envelope curve of each portion of the voltage signal and performing an autocorrelation analysis on waveform data obtained by dividing the voltage values of each portion of the voltage signal by voltage values of the envelope curve.