Original figure legend: <i>MPE simplified optical pathways. In the MPE optical pathways the emission pinhole is removed since the only emitted light reaching the sensor is coming from the currently point scanned volume in the sample. No other fluorescence signal is produced elsewhere.</i>
Alberto Diaspro, Paolo Bianchini, Giuseppe Vicidomini, Mario Faretta, Paola Ramoino and Cesare Usai
CC BY 2.0
<p><i>Multi-photon excitation microscopy.</i> BioMedical Engineering OnLine, 2006, 5:36. <br>
DOI:10.1186/1475-925X-5-36. <br></p>
<a rel="nofollow" class="external free" href="http://www.biomedical-engineering-online.com/content/5/1/36">http://www.biomedical-engineering-online.com/content/5/1/36</a>