Abstract: Various embodiments of the present technology may provide methods and apparatus for region of interest histogramming. The apparatus may use a state machine in conjunction with a memory to generate a first histogram having a fixed number of bins over a first range and generate a second histogram having the fixed number of bins over a region of interest selected based on the first peak of the first histogram.

Abstract: Various embodiments of the present technology may provide methods and apparatus for region of interest histogramming. The apparatus may use a state machine in conjunction with a memory to generate a first histogram having a fixed number of bins over a first range and generate a second histogram having the fixed number of bins over a region of interest selected based on the first peak of the first histogram.

Abstract: The invention relates to new derivatives of 5-aminolevulinic acid (5-ALA) and their use as photosensitizing agents. In particular, it relates to compounds of general formula I and their pharmaceutically acceptable salts, to methods for preparing such compounds and their medical and cosmetic use, for example in methods of photodynamic therapy and diagnosis: wherein R1 represents a hydrogen atom or an optionally substituted alkyl or cycloalkyl group; R2, each of which may be the same or different, represents a hydrogen atom or an optionally substituted alkyl group; and X is a linking group.

Abstract: The invention relates to new derivatives of 5-aminolevulinic acid (5-ALA) and their use as photosensitizing agents. In particular, it relates to compounds of general formula I and their pharmaceutically acceptable salts, to methods for preparing such compounds and their medical and cosmetic use, for example in methods of photodynamic therapy and diagnosis: wherein R1 represents a hydrogen atom or an optionally substituted alkyl or cycloalkyl group; R2, each of which may be the same or different, represents a hydrogen atom or an optionally substituted alkyl group; and X is a linking group.

Abstract: A multifilament sheet, tow or web of acrylonitrile precursor fibres are passed through a pre-heat zone at a temperature at least 100.degree. C below the critical temperature. The material is then passed through a two-stage oxygenation zone comprising a first stage at 220.degree. to 250.degree. C and a second stage at 260.degree. to 300.degree. C. The material passes straight through the oxygenation zone and is held in sufficient uniform tension to stretch the fibres during heating and oxygenation. The oxygenated material is then passed through a carbonizing zone comprising at least one stage at 1050.degree. to 1600.degree. C under non-oxidizing conditions. The resulting carbon fibre has a mean Young's modulus of at least 25 .times. 10.sup.6 p.s.i. and a mean tensile strength of at least 250,000 p.s.i.