An improved method of obtaining fluorescence measurements which may be used as a measure of the CETP-catalyzed rate of transfer of a lipophilic non-polar fluorescent cholesteryl ester between lipoprotein particles is disclosed. The block is formed The block is formed from elementary capacitive modules. 8 nm laser line in the spectrum. The at least one of the plurality of pixel sensors with the masking pattern receives a lower dosage than the non-masked pixel sensor.