Radiation detection method and apparatus

• US 5,007,432 A
• Filed: 07/10/1989
• Issued: 04/16/1991
• Est. Priority Date: 04/27/1987
• Status: Expired due to Term

• Current Assignee: Eltec Instruments, Inc.
• Original Assignee: Eltec Instruments, Inc.
• Inventors: Keller, Hans J., Kuster, Walter A.
• Primary Examiner(s): Hindenburg, Max
• Application Number:
  US07/377,725
• Time in Patent Office: 645 Days
• Field of Search: 128/736, 128/738, 128/664, 374/121, 374/130-131, 374/116
• US Class Current: 600/549
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: G01J 2005/066 Differential arrangement, i.e. sensitive/not sensitive
• CPC Class Codes: G01J 5/04 Casings
• CPC Class Codes: G01J 5/047 Mobile mounting; Scanning arrangements
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0804 Shutters
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/0808 Convex mirrors
• CPC Class Codes: G01J 5/0813 Planar mirrors; Parallel phase plates
• CPC Class Codes: G01J 5/0871 Beam switching arrangements; Photodetection involving different fields of view for a single detector

Abstract

A medical diagnostic method and apparatus employs differential radiation detection apparatus for remotely detecting temperature differentials between a plurlity of areas on the surface of an object having a plurality of lenses which each focus a beam of radiation from a corresponding area of the body onto a radiation detector in such a way that not more than one field of view reaches the detector at any time.

Claims

1. A medical diagnostic apparatus for detecting the temperature differential between two sites on the surface of a person'"'"'s body comprising:

a single thermal radiation detector;

a plurality of lenses arranged to respectively receive thermal radiation from different sites on the person'"'"'s body along different optical paths and to focus the received radiation onto the single detector;

means for alternately interrupting the flow of thermal radiation from the different sites to the detector so that the thermal radiation from not more than one of the sites is received by the detector at any time;

means for converting the received thermal radiation from each site to corresponding temperature indicative signals;

means for averaging the temperature indicative signals derived from each corresponding site to determine the surface temperature of each site; and

wherein

the plurality of lenses are concentric and lie in a common plane.

2. The apparatus of claim 1 wherein the lenses are combined on a common substrate.

3. The apparatus of claim 1 wherein the means for interrupting the thermal radiation to the detector comprises a switching shutter mechanism.

4. A medical diagnostic method for remotely determining the temperature of a plurality of sites on the surface of a person'"'"'s body comprising the steps of:

providing a single thermal radiation detector;

providing lens means which respectively receive thermal radiation from different sites on the surface of the person'"'"'s body and focus the received radiation onto the detector;

alternately interrupting the flow of thermal radiation to the detector from the different sites so that the thermal radiation from not more than one of the sites is received by the detector at any time;

converting the received thermal radiation from each site to corresponding temperature indicative signals; and

averaging the temperature indicative signals derived from each corresponding site to determine the surface temperature of each site.

5. The method of claim 4 further comprising the step of determining the temperature differential between the two sites.

6. An apparatus for detecting the temperatures of a plurality of areas on the surface of an object comprising:

a thermal radiation detector;

a plurality of concentric lenses arranged to respectively receive thermal radiation from different areas on the surface of an object;

a plurality of deflecting mirrors positioned to respectively deflect the radiation from the field of view from each of the lenses onto the detector such that the radiation from the fields of view focus on the detector; and

means for passing radiation from not more than one field of view to the detector at any time.

7. The apparatus of claim 6 wherein the means for passing radiation from not more than one field of view to the detector at any time comprises a mechanical switching shutter mechanism.

8. The apparatus of claim 6 wherein said lenses are coplanar.

9. The apparatus of claim 8 wherein the lenses are fixed on a common substrate.

10. The apparatus of claim 9 wherein the means for passing radiation from not more than one field of view to the detector at any time comprises a switching shutter mechanism.

11. An apparatus for detecting the temperatures of a plurality of areas on the surface of an object comprising:

a thermal radiation detector;

a plurality of lenses arranged to respectively have different fields of view of the object of which the temperature is to be determined;

a mirror switching mechanism which oscillates at a predetermined frequency; and

a plurality of deflecting mirrors positioned to respectively deflect the radiation from the fields of view from the lenses onto the mirror switching mechanism which in turn alternately deflects each field of view onto the detector.

12. The apparatus according to claim 11 wherein the radiation detector comprises an infrared pyroelectric detector.

13. The apparatus of claim 11 wherein the detector comprises a differentially connected radiation sensor.

14. The apparatus according to claim 11 further comprising:

means for repeatedly measuring the temperatures of each of the areas; and

means for averaging the measured temperatures of each area for determining the surface temperature of each area.

15. An apparatus for detecting the temperatures of a plurality of areas on the surface of an object comprising:

an infrared radiation detector;

a plurality of combinations of mirror-lens arrangements for receiving and focusing thermal radiation from different areas onto the detector;

means for alternately interrupting the thermal radiation from the different areas to said detector at a predetermined frequency so that the thermal radiation from not more than one area of the object is received by the detector at any time; and

means for averaging the temperature radiation received from each area a number of times and comparing that average with the average for another area.

16. A method for remotely determining the temperatures of a plurality of areas on the surface of an object comprising the steps of:

providing a thermal radiation detector;

providing a plurality of lenses which respectively receive thermal radiation from different areas on the surface of the object and focus the radiation onto the detector;

alternately interrupting the flow of thermal radiation to the detector from the different areas so that the thermal radiation from not more than one area of the object is received by the detector at any time;

converting the received thermal radiation to a temperature indicative signal; and

averaging a plurality of the temperature indicative signals for determining the average surface temperature of each area, and comparing that average with the average for another area.

17. A method for detecting the occurrence of ovulation in a woman'"'"'s menstrual cycle, comprising the steps of:

providing a thermal radiation detector;

providing at least two concentrically arranged lenses lying in a common plane;

focusing one of the two lenses on a hormonally sensitive area of the body of the woman;

focusing another one of the two lenses on a hormonally insensitive area of the body of a woman;

positioning each of the two lenses such that thermal radiation from each area is focused onto the thermal radiation detector;

alternately blocking the radiation from each of the at least two lenses so that only radiation from one of the areas is received by the detector at any time;

converting the received radiation to temperature indicative signals;

comparing the signals corresponding to one of the areas to the signals corresponding to the other of the areas;

providing an indication of ovulation when the signals are representative of different temperatures at each of the areas; and

averaging a plurality of the temperature indicative signals for determining the average surface temperature of each area, and comparing that average with the average for another area.