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The stripe illumination lies between the illumination in thespatial-frequency domain and the point illumination. Although the stripeillumination has a periodic structure as the illumination in thespatial-frequency domain, light from the stripe illumination can reach deepregions in biological tissue since it can be regarded as an array of pointilluminations. For a pair of a source and a detector, the shape of light pathswhich connect the source and detector is called the banana shape. First, weinvestigate the depth of the banana. In the case of the zero boundarycondition, we found that the depth of the center of the banana is $d_{\rmSD}/(2\sqrt{2})$, where $d_{\rm SD}$ is the distance between the source anddetector on the boundary. In general, the depth is about $0.3d_{\rm SD}$ when$d_{\rm SD}\approx2\,{\rm cm}$ and the ratio of refractive indices on theboundary is about $1.37$. Next, we perform diffuse optical tomography for thestripe illumination against forward data taken by Monte Carlo simulation. Weconsider an impulse illumination of the shape of a stripe. This time-resolvedmeasurement is more informative than conventional continuous-wave measurementsin the spatial-frequency domain.

The depth of the banana and the impulse stripe illumination for diffuse optical tomography