Representative 99mTc-HYNIC-annexin V scintigraphy (TAVS) images of EL4 lymphoma bearing mice treated with irradiation. Mice were injected 4-8 MBq radiolabeled annexin V 24 hours post-radiation and imaged 2 h later. The images show increased annexin V uptake in tumor as radiation dose increased. The white arrow indicates the implanted tumor. A: 0 Gy; B:2 Gy; C:4 Gy; D:8 Gy.