Results of the consensus reading with respect to the image quality score. Results of the consensus reading with respect to the image quality score for each of the eight different SPECT protocols (mean image quality score ± SEM). MIBI protocols achieved the highest image quality score for both intravenous injection routes; TETRO was comparable in image quality for retroorbital injections whereas for tail vein injections, image quality of TETRO was scored lower. In contrast to the intravenous protocols, all i.p. protocols revealed very poor image quality.