} else if (interpType == Backprojector::INTERP_LINEAR) {
double dPos = L / detInc; // position along detector
double dPosFloor = floor (dPos);
int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
double frac = dPos - dPosFloor; // fraction distance from det
} else if (interpType == Backprojector::INTERP_LINEAR) {
double dPos = L / detInc; // position along detector
double dPosFloor = floor (dPos);
int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
double frac = dPos - dPosFloor; // fraction distance from det