Reconstructing chromosphere concentration images directly by continuous-wave diffuse optical tomography.
نویسندگان
چکیده
We present an algorithm to reconstruct chromosphere concentration images directly rather than following the traditional two-step process of reconstructing wavelength-dependent absorption coefficient images and then calculating chromosphere concentration images. This procedure imposes prior spectral information into the image reconstruction that results in a dramatic improvement in the image contrast-to-noise ratio of better than 100%. We demonstrate this improvement with simulations and a dynamic blood phantom experiment.
منابع مشابه
-
In this paper a method for digitally recording four quarter-reference-wave-holograms (by CCD) in a Mach-Zehnder interferometer setup, and reconstructing the object wave-front by numerical method is presented. The terms of direct transmission, auto-correlation and conjugate wave in the four wave reconstruction are cancelled out and only one original object wave is left after overlapping. Reconst...
متن کاملFunctional imaging of the human brain using a modular, fibre-less, high-density diffuse optical tomography system
We present the first three-dimensional, functional images of the human brain to be obtained using a fibre-less, high-density diffuse optical tomography system. Our technology consists of independent, miniaturized, silicone-encapsulated DOT modules that can be placed directly on the scalp. Four of these modules were arranged to provide up to 128, dual-wavelength measurement channels over a scalp...
متن کاملReduction of image artifacts induced by change in the optode coupling in time-resolved diffuse optical tomography.
Tomographic images of the optical properties can be reconstructed using inversion algorithms for diffuse optical tomography (DOT); however, changes in the optode coupling that occurs while obtaining an object's measurements may often lead to the presence of artifacts in the reconstructed images. To reduce the number of artifacts induced by optode coupling, previous studies have introduced (unkn...
متن کاملDynamic contact-free continuous-wave diffuse optical tomography system for the detection of vascular dynamics within the foot
We present a dynamic contact-free continuous-wave diffuse optical tomography system for the detection and monitoring of peripheral arterial disease (PAD) in the foot. Peripheral Arterial Disease (PAD) is the narrowing of the functional area of the artery generally due to atherosclerosis. It affects between 8-12 million people in the United States and if untreated this can lead to ulceration, ga...
متن کاملConstrained Reconstruction Techniques for Diffuse Optical Tomography
Three-dimensional diffuse optical tomography (DOT) attempts to map in vivo tissue blood oxygenation and blood volume levels by reconstructing the spatial distribution of the optical absorption coefficient from intensity measurements on the surface of the body. This problem is typically ill-posed due to the large attenuation and scattering of the diffuse wave. In addition, certain applications, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Optics letters
دوره 29 3 شماره
صفحات -
تاریخ انتشار 2004