Biometric apparatus and image-generating method

A bioinstrumentation apparatus comprising:

• an irradiation unit irradiating a measurement region of a subject with radiation rays or sonic waves;
• a detection unit detecting the radiation rays or the sonic waves diffused from the measurement region;
• and
• a computing unit computing a radiation ray or sonic wave absorption coefficient distribution inside the measurement region on the basis of an output signal from the detection unit to generate a reconstructed image for the interior of the measurement region, wherein
• the computing unit calculates J coefficients wj which are set for every pixel of the reconstructed image and more than 0 and not more than 1 (where an index j is an integer from 1 to J, and J is the number of pixels of the reconstructed image), and carries out successive approximation computation by means of the following iterative formula
• xj(k+1)=xj(k)+wjdj(k)
• (where k is an integer from 1 to N, N is the number of times for carrying out iterative computation, xj(k) is a pixel value of the jth pixel on the kth iterative computation, and dj(k) is an update amount of the jth pixel on the kth iterative computation), thereby generating the reconstructed image.

An image generating method of irradiating a measurement region of a subject with light, detecting diffused light from the measurement region, and computing a light absorption coefficient distribution inside the measurement region on the basis of the detected signal to generate a reconstructed image for the interior of the measurement region, wherein

• the method calculates J coefficients wj which are set for every pixel of the reconstructed image and more than 0 and not more than 1 (where an index j is an integer from 1 to J, and J is the number of pixels of the reconstructed image), and
• carries out successive approximation computation by means of the following iterative formula
• xj(k+1)=xj(k)+wjdj(k)
• (where k is an integer from 1 to N, N is the number of times for carrying out iterative computation, xj(k) is a pixel value of the jth pixel on the kth iterative computation, and dj(k) is an update amount of the jth pixel on the kth iterative computation), thereby generating the reconstructed image.

An image generating method of irradiating a measurement region of a subject with radiation rays or sonic waves, detecting the radiation rays or the sonic waves diffused from the measurement region, computing a radiation ray or sonic wave absorption coefficient distribution inside the measurement region on the basis of the detected signal to generate a reconstructed image for the interior of the measurement region, wherein

• the method calculates J coefficients wj which are set for every pixel of the reconstructed image and more than 0 and not more than 1 (where an index j is an integer from 1 to J, and J is the number of pixels of the reconstructed image), and
• carries out successive approximation computation by means of the following iterative formula
• xj(k+1)=xj(k)+wjdj(k)
• (where k is an integer from 1 to N, N is the number of times for carrying out iterative computation, xj(k) is a pixel value of the jth pixel on the kth iterative computation, and dj(k) is an update amount of the jth pixel on the kth iterative computation), thereby generating the reconstructed image.