Racial distinction of the unknown facial identity recognition mechanism by event-related fMRI.

A body of evidence exists indicating that the function of the fusiform area of the face is selectively involved in the perception of faces, and in particular, in perceiving racial differences. In the present study, we investigated the neural substrates of the face-selective region (the fusiform face area, FFA) in the ventral occipital-temporal cortex and examined their role in case of same-racial face recognition by employing event-related fMRI. Twelve healthy subjects (Oriental-Koreans) performed the familiarity judgment tasks while they were being presented with familiar and unknown faces of Oriental-Koreans and Caucasian-Americans.

Determination of N(pp)(gas) and N(pp)(D) for a plane-parallel chamber.

The purpose of this work is to investigate the consistency of determining N(pp)(gas) and N(pp)(D) by using three independent calibration methods from the AAPM TG 39 and IAEA TRS 381 protocols: 1) calibration with a high-energy electron beam in a phantom; 2) in-phantom calibration in a (60)Co beam; and 3) in-air calibration in a (60)Co beam. The plane-parallel chamber considered was the PTW-Markus and the comparisons were made against a calibrated PTW cylindrical Farmer-type chamber 30001. The phantom material used for the electron beam and (60)Co in-phantom methods was a solid water phantom (RW3).