Posts with the tag: two photon
Phosphorescence lifetime imaging microscopy (PLIM) allows substances or tissues with different phosphorescence lifetimes to be identified with high spatial resolution. PLIM hasn’t found many practical applications so far, but it could be useful as a way of measuring oxygen concentration in tissues. Depth resolved images can be obtained using multi-photon excitation, a technique which ensures that all the signal comes from the focal plane. Unfortunately, relatively long phosphorescent lifetimes make the point-by-point scanning used in multi-photon microscopy very time consuming. Attempts to improve the frame rate using parallel excitation can result in cross-talk between pixels and blurring of the image. Now, a group from Cornell University has devised a way to acquire parallel excitation PLIM images which are free from cross-talk.