Radiation from CT Scans compared to a chest x-ray

Radiation from CT scans compared to a chest x-ray:
Standard Chest X-ray 0.01-0.15 mGy
Head CT 56 mGy (373 x-rays)
Cardiac CT 40-100 mGy (266-666 x-rays)
Mammogram 3 mGy (20 x-rays)
Neonatal Abdominal CT 20 mGy (133 x-rays)
Barium Enema 15 mGy (100 x-rays)
Abdomen CT 14 mGy (93 x-rays)
Chest CT 13 mGy (86 x-rays)
Chest/Abd/Pelvis 12 mGy (80 x-rays)
PET/CT Scan whole body 11mGy (73 x-rays)
PET/CT Brain 64mGy (426 x-rays)
PET/CT Babies/Children 4-6mGy (26-40 x-rays)