METHODS: Sixty lung tissue samples were obtained from 30 patients who underwent pulmonary lobectomy. Samples were examined with ATR-FTIR spectroscopy before histologic diagnosis. Peak positions, intensities, and full width at half maximum of each absorbent band were measured, and the relative intensity ratios were calculated. UV-Visible Spectroscopy. A diagram of the components of a typical spectrometer are shown in the following diagram. The functioning of this instrument is relatively straightforward. A beam of light from a visible and/or UV light source (colored red) is separated into its component wavelengths by a prism or diffraction grating. 2) Use FindLevel to find the half maximum on the right and left side of your shape (make sure to use height/2 + baseline as input). Use the /R=(start, end) or /EDGE parameter to search for the two crossing values. In the field of Raman spectroscopy, it is known that the full width at half maximum intensity of the G band (G-FWHM) in the first order Raman spectrum for carbon material is a parameter for graphitization, though it is qualitative evidence. We've been doing Gamma ray spectroscopy and have peaks from various sources. We'd use Poisson statistics, but obviously the detector doesn't have a resolution of zero, thus we are summing the counts over the Full Width Half Maximum. Full Width Half Maximum (FWHM) of a spectral peak As with MR imaging, T2 determines the rate of decay of the spectroscopic signal. MRS sequences aquired at long TE's will have smaller peaks since more T2 decay has occurred. For a fixed TE, metabolites with shorter T2's will decay faster and have smaller peaks than those with longer T2's. Spectral Resolution Spectral resolution is a measure of the ability to separate nearby features in wavelength space.,' minimum wavelengt h separation of two resolved features. ' O O O R Delta lambda ± often set to the full-width at half-maximum of an unresolved line ± can be measured in the data ± depends on data analysis A common standard is the definition of resolution based upon \(\Delta m\) being Full Width of the peak at Half its Maximum height, sometimes abbreviated ' FWHM '. This acronym should preferably be defined the first time it is used.