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Clinical Comparison of Standard-Dose and 50% Reduced—Dose Abdominal CT: Effect on Image Quality

¹ All authors: Department of Radiology, Massachusetts General Hospital and Harvard Medical School, White 270-E, 55 Fruit St., Boston, MA 02114.

View larger version (134K): [in a new window]   Fig. 1A. —68-year-old man with pancreatic cancer who weighed 100 lb (45 kg). Equilibrium phase contrast-enhanced CT scan was obtained with standard-dose radiation of 240 mA and 140 kVp.

View larger version (145K): [in a new window]   Fig. 2B. —68-year-old man with pancreatic cancer who weighed 100 lb (45 kg). Equilibrium phase contrast-enhanced CT scan obtained with 50% reduced—dose radiation of 120 mA and 140 kVp has image quality comparable to that of A.

View larger version (130K): [in a new window]   Fig. 2A. —72-year-old woman with colon cancer who weighed 160 lb (72 kg). Equilibrium phase contrast-enhanced CT scan was obtained with standard-dose radiation of 260 mA and 140 kVp.

View larger version (146K): [in a new window]   Fig. 2B. —72-year-old woman with colon cancer who weighed 160 lb (72 kg). Equilibrium phase contrast-enhanced CT scan obtained with 50% reduced—dose radiation of 130 mA and 140 kVp shows no appreciable loss of anatomic detail.

View larger version (115K): [in a new window]   Fig. 3A. —69-year-old woman with renal cell cancer who weighed 200 lb (90 kg). Equilibrium phase contrast-enhanced CT scan was obtained with standard-dose radiation of 280 mA and 140 kVp.

View larger version (125K): [in a new window]   Fig. 3B. —69-year-old woman with renal cell cancer who weighed 200 lb (90 kg). Equilibrium phase contrast-enhanced CT scan obtained with 50% reduced—dose radiation of 140mA and 140kVp shows greater noise than that seen in A.

View larger version (133K): [in a new window]   Fig. 4A. —77-year-old man weighing 170 lb (77 kg) who had liver metastases from breast cancer. Equilibrium phase contrast-enhanced CT scan was obtained with standard-dose radiation of 260 mA and 140 kVp.

View larger version (160K): [in a new window]   Fig. 4B. —77-year-old man weighing 170 lb (77 kg) who had liver metastases from breast cancer. Equilibrium phase contrast-enhanced CT scan was obtained with 50% reduced—dose radiation of 130 mA and 140 kVp. Lesions are visualized on scans obtained with both standard and reduced doses of radiation but are better defined on scan obtained with standard-dose radiation (A).

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