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Fig. 4D —63-year-old man with large cell carcinoma of left lower lobe. Transverse SPECT images show accumulation of thallium-201 in a mediastinal lymph node (arrowheads). On early images without (A) and with (B) attenuation correction, accumulation of thallium-201 in lymph nodes was higher than on delayed images without (C) and with (D) attenuation correction. On early (B) and delayed (D) images with attenuation correction, accumulation in lymph nodes was more clearly depicted than on early (A) and delayed (C) images without attenuation correction.