Heart sound detector and synchronization for diagnostics
First Claim
1. A method of controlling diagnostic apparatus to acquire cardiac or heart function data or images comprising the steps of:
- detecting the occurence of a first heart sound and a second heart sound when both are coincident with a prescribed heart sound enable window adjustable within prescribed limits and beginning with the occurence of the first heart sound;
providing an accurately timed systole trigger signal coincident with systole heart function as derived from the heart sound signal; and
controlling data acquistion of diagnostic apparatus in accordance with said accurately time systole trigger signal.
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Abstract
From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time. For diagnostics synchronization signals developed exclusively from the heart sound signals are used to validate data from diagnostic equipment such as a gamma camera.
59 Citations
15 Claims
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1. A method of controlling diagnostic apparatus to acquire cardiac or heart function data or images comprising the steps of:
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detecting the occurence of a first heart sound and a second heart sound when both are coincident with a prescribed heart sound enable window adjustable within prescribed limits and beginning with the occurence of the first heart sound; providing an accurately timed systole trigger signal coincident with systole heart function as derived from the heart sound signal; and controlling data acquistion of diagnostic apparatus in accordance with said accurately time systole trigger signal. - View Dependent Claims (2, 3, 4)
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5. A method of controlling diagnostic apparatus of the type which produces cardiac cycle analysis data comprising:
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storing cardiac cycle analysis data for a cardiac cycle in a temporary storage memory, the cardiac cycle analysis data being stored in serial time relationship; detecting the occurrence of a first occuring heart sound; detecting the occurrence of a second occuring heart sound within a pre-established heart sound enable window adjustable between prescribed limits until the detection of the second heart sound; producing an accurately timed heart sound signal in accordance with the second occuring heart sound signal; selecting a portion of the temporarily stored data that is desired for data analysis in accordance with the accurately timed heart sound signal; and controlling the read-out of the desired portion of the temporarily stored data for data analysis to diagnostic apparatus. - View Dependent Claims (6, 7, 8, 9, 10)
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11. Apparatus for controlling the acquiring and reading-out of cardiac cycle data produced by diagnostic apparatus, the cardiac cycle data being produced in association with an ongoing heart sound signal comprising:
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first means for temporarily storing cardiac cycle data, said cardiac cycle data being received at a data input and representing one or more cardiac parameters in serial time relationship; second means responsive to the ongoing heart sound signal for producing a trigger signal in predetermined time relationship to the ongoing heart sound signal to select the portion of said stored cardiac cycle data that is desired for data analysis by additional diagnostic apparatus; and means responsive to said second means for controlling the read-out of said desired portion data from said temporary storing means. - View Dependent Claims (12, 13, 14, 15)
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Specification