FIGURE 4. Short-axis images of rest and redistribution ²⁰¹Tl SPECT for patient who shows reversible perfusion defects in anterior and septal regions. In midventricular septum, CVR decreased after NTG spray from 151 to 126 mm Hg/(mL/min/g), whereas CVR did not significantly change in lateral wall with normal ²⁰¹Tl activity (130 vs. 132 mm Hg/[mL/min/g]).