Diffuse<unk>  In near-infrared diffuse<unk>  (DOT), transmitted diffuse photons are collected and a diffusion equation is used to reconstruct an image from them. Time-of-flight diffuse<unk>  A variant of<unk>  uses<unk>  time-of-flight sampling as an attempt to distinguish transmitted light from scattered light. This concept has been used in several academic and commercial systems for breast cancer imaging and cerebral measurement. The key to separation of absorption from scatter is the use of either time-resolved or frequency domain data which is then matched with a diffusion theory based estimate of how the light propagated through the tissue. The measurement of time of flight or frequency domain phase shift is essential to allow separation of absorption from scatter with reasonable accuracy. Fluorescence molecular tomography In fluorescence molecular tomography, the fluorescence signal transmitted through the tissue is normalized by the excitation signal transmitted through the tissue, and so many of the fluorescence tomography systems do not require the use of time-resolved or frequency domain data, although research is still ongoing in this area. Since the applications of fluorescent molecules in humans are fairly limited, most of the work in fluorescence tomography has been in the realm of pre-clinical cancer research. Both commercial systems and academic research have been shown to be effective in tracking tumor protein expression and production, and tracking response to therapies. Confocal diffuse tomography Confocal diffuse tomography uses a powerful laser to illuminate a sample through a scattering medium, followed by deconvolution with a calibrated diffusion operator to estimate a volume without the effects of diffusive scattering and subsequent application of a confocal inverse filter to recover the sample image.
Optical tomography
X-ray vision
Radiochemistry
Terahertz tomography
Iatrochemistry
Ultrasound transmission tomography
Biomedical spectroscopy
Digital X-ray radiogrammetry