Tissue oximetry probe geometry for robust calibration and self-correction

A method comprising:

• providing a sensor head for a tissue oximetry device comprising an arrangement of source structures and detector structures comprising:
• a first source structure and a second source structure;
• a plurality of detector structures arranged asymmetrically in the arrangement, asymmetric about a point on a line passing through the first and second source structures;
• a first detector structure of the arrangement, wherein a first distance is from the first detector structure to the first source structure, a second distance is from the first detector structure to the second source structure, and the first distance is greater than the second distance;
• a second detector structure of the arrangement, wherein a third distance is from the second detector structure to the first source structure, a fourth distance is from the second detector structure to the second source structure, and the fourth distance is greater than the third distance;
• a third detector structure of the arrangement, wherein a fifth distance is from the third detector structure to the first source structure, a sixth distance is from the third detector structure to the second source structure, the fifth distance is different from the first distance and the second distance, and the sixth distance is different from the first distance and the second distance;
• and
• a fourth detector structure of the arrangement, wherein a seventh distance is from the fourth detector structure to the first source structure, an eighth distance is from the fourth detector structure to the second source structure, the seventh distance is different from the first, second, fifth, and sixth distances, and the eighth distance is different from the first, second, fifth, and sixth distances;
• and
• using information collected from the plurality of detector structures arranged asymmetrically to determine a correction due to a variation between the first and second source structures and an oxygen saturation value and not using the third and fourth detector structures to determine the correlation.

A method comprising:

• providing a sensor head for a tissue oximetry device comprising:
• a plurality of detector structures arranged on the sensor head;
• and
• a first source structure and a second source structure positioned in a line on the sensor head, wherein a first detector structure of the detector structures is a first distance from the first source structure,
• a second detector structure of the detector structures is a second distance from the second source structure,
• a third detector structure of the detector structures is a third distance from the first source structure,
• the first and second detector structures are not positioned on the line,
• the first distance and the second distance are equal, and
• the first distance and the third distance are not equal;
• and
• enclosing a processing module in a housing coupled to the sensor head, wherein the processing module is adapted for using information collected from the first and the second detector structures and not from the third detector structure to determine a correction due to a variation between the first and second source structures.

A method comprising:

• providing a sensor head for a tissue oximetry device comprising an arrangement of source structures and detector structures comprising:
• a first source structure and a second source structure;
• a plurality of detector structures arranged symmetrically in the arrangement, symmetric about a point on a line passing through the first and second source structures;
• a first detector structure of the arrangement, wherein a first distance is from the first detector structure to the first source structure, a second distance is from the first detector structure to the second source structure, and the first distance is greater than the second distance;
• a second detector structure of the arrangement, wherein a third distance is from the second detector structure to the first source structure, a fourth distance is from the second detector structure to the second source structure, and the fourth distance is greater than the third distance;
• a third detector structure of the arrangement, wherein a fifth distance is from the third detector structure to the first source structure, a sixth distance is from the third detector structure to the second source structure, the fifth distance is different from the first distance and the second distance, and the sixth distance is different from the first distance and the second distance;
• and
• a fourth detector structure of the arrangement, wherein a seventh distance is from the fourth detector structure to the first source structure, an eighth distance is from the fourth detector structure to the second source structure, the seventh distance is different from the first, second, and fifth distances, and the eighth distance is different from the first, second, and sixth distances;
• and
• using information collected from the plurality of detector structures arranged symmetrically to determine a correction due to a variation between the first and second source structures and an oxygen saturation value and not using the third detector structure to determine the correlation.