Apparatus and method for detecting blood flow signal free from motion artifact and stress test apparatus using the same

A method to detect a blood flow signal free from a motion artifact, the method comprising:

• detecting the blood flow signal sensed from a body of an examinee;
• determining peak points in the detected blood flow signal and calculating correlation coefficients of each peak point using a predetermined base pattern;
• and
• determining, using at least one processing device, the motion artifact using the calculated correlation coefficients and removing the motion artifact from the blood flow signal,
• wherein the determining the motion artifact using the calculated correlation coefficients compares the calculated correlation coefficients with a predetermined threshold value and determines whether the correlation coefficients are less than the predetermined threshold value.

A stress test apparatus using an apparatus to detect a blood flow signal free from a motion artifact, comprising:

• a motion artifact removing section to remove the motion artifact caused by an examinee from the blood flow signal detected from a body of the examinee;
• a heartbeat information calculating section to calculate heartbeat information using the blood flow signal from which the motion artifact is removed utilizing the motion artifact removing section;
• and
• a stress testing section to calculate a stress index using the heartbeat information calculated utilizing the heartbeat information calculating section and checking a physical state of the examinee,
• a base pattern correlation coefficient calculating part to determine peak points in the blood flow signal sensed from the physical state of the examinee using the blood flow sensing unit, and to calculate correlation coefficients of each peak point using a predetermined base pattern;
• and
• a motion artifact processing part to determine the motion artifact using the calculated correlation coefficients and to remove the motion artifact from the blood flow signal, and
• wherein the determining the motion artifact using the calculated correlation coefficients compares the calculated correlation coefficients with a predetermined threshold value and determines whether the correlation coefficients are less than the predetermined threshold value.

A computer medium having computer-readable instructions stored thereon and executable by a computer to detect a blood flow signal free from a motion artifact, the computer-readable instructions comprising instructions for:

• using base pattern correlation coefficient calculating instructions to determine peak points in the blood flow signal sensed from a body of an examinee, and to calculate correlation coefficients of each peak point using a predetermined base pattern;
• and
• using motion artifact processing and the calculated correlation coefficients to determine the motion artifact and to remove the motion artifact from the blood flow signal,
• wherein the motion artifact is determined by comparing the calculated correlation coefficients with a predetermined threshold value and determining whether the correlation coefficients are less than the predetermined threshold value.

A computer medium having computer-readable instructions stored thereon and executable by a computer to detect a blood flow signal free from a motion artifact, the computer-readable instructions comprising instructions for performing:

• detecting the blood flow signal sensed from a body of an examinee;
• determining peak points in the detected blood flow signal and calculating correlation coefficients of each peak point using a predetermined base pattern;
• and
• determining the motion artifact using the calculated correlation coefficients and removing the motion artifact from the blood flow signal,
• wherein the determining the motion artifact using the calculated correlation coefficients compares the calculated correlation coefficients with a predetermined threshold value and determines whether the correlation coefficients are less than the predetermined threshold value.

A computer medium having computer-readable instructions stored thereon and executable by a computer to detect a blood flow signal free from a motion artifact, the computer-readable instructions comprising instructions for:

• removing the motion artifact caused by an examinee from the blood flow signal detected from a body of the examinee;
• calculating heartbeat information using the blood flow signal from which the motion artifact is removed;
• and
• calculating a stress index using both the heartbeat information and information on a physical state of the examinee,
• calculating a base pattern correlation coefficient to determine peak points in the blood flow signal sensed from the physical state of the examinee, and calculating correlation coefficients of each peak point using a predetermined base pattern;
• and
• using motion artifact processing to determine the motion artifact using the calculated correlation coefficients and removing the motion artifact from the blood flow signal,
• wherein the determining the motion artifact using the calculated correlation coefficients compares the calculated correlation coefficients with a predetermined threshold value and determines whether the correlation coefficients are less than the predetermined threshold value.

An apparatus to remove a motion artifact from a filtered blood flow signal, wherein the filtered blood flow signal has been filtered to obtain waveforms of a predetermined frequency band, the apparatus comprising:

• a base pattern correlation coefficient calculating unit to determine peak points in the waveforms of the predetermined frequency band, and to calculate correlation coefficients of each peak point using a predetermined base pattern;
• and
• a motion artifact processing unit to determine the motion artifact using the calculated correlation coefficients and to remove the motion artifact from the blood flow signal,
• wherein the motion artifact is determined by comparing the calculated correlation coefficients with a predetermined threshold value and determining whether the correlation coefficients are less than the predetermined threshold value.