  The stripe illumination lies between the illumination in the
spatial-frequency domain and the point illumination. Although the stripe
illumination has a periodic structure as the illumination in the
spatial-frequency domain, light from the stripe illumination can reach deep
regions in biological tissue since it can be regarded as an array of point
illuminations. For a pair of a source and a detector, the shape of light paths
which connect the source and detector is called the banana shape. First, we
investigate the depth of the banana. In the case of the zero boundary
condition, we found that the depth of the center of the banana is about
$0.2d_{\rm SD}$ for typical optical parameters, where $d_{\rm SD}$ is the
distance between the source and detector on the boundary. In general, the depth
depends on the absorption and diffusion coefficients, and the ratio of
refractive indices on the boundary. Next, we perform diffuse optical tomography
for the stripe illumination against forward data taken by Monte Carlo
simulation. We consider an impulse illumination of the shape of a stripe. By
this time-resolved measurement, the absorption coefficient of a target is
reconstructed.
