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Standard-Dose and 50%—Reduced-Dose Chest CT: Comparing the Effect on Image Quality

Srinivasa R. Prasad1, Conrad Wittram, Jo-Anne Shepard, Theresa McLoud and James Rhea

1 All authors: Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Founders 216, 55 Fruit St., Boston, MA 02114.



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  		Fig. 1A. —74-year-old woman with history of breast cancer and weight of 48 kg. Contrast-enhanced CT scans (mediastinal window settings) obtained just inferior to level of carina using 140 kVp and 220 mAs (A) and 140 kVp and 110 mAs (B) show no significant change in image quality.

 


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  		Fig. 1B. —74-year-old woman with history of breast cancer and weight of 48 kg. Contrast-enhanced CT scans (mediastinal window settings) obtained just inferior to level of carina using 140 kVp and 220 mAs (A) and 140 kVp and 110 mAs (B) show no significant change in image quality.

 


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  		Fig. 1C. —74-year-old woman with history of breast cancer and weight of 48 kg. Contrast-enhanced CT scans (lung window settings) obtained using 140 kVp and 220 mAs (C) and 140 kVp and 110 mAs (D) show that image quality of low-dose CT is comparable with that of standard-dose CT.

 


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  		Fig. 1D. —74-year-old woman with history of breast cancer and weight of 48 kg. Contrast-enhanced CT scans (lung window settings) obtained using 140 kVp and 220 mAs (C) and 140 kVp and 110 mAs (D) show that image quality of low-dose CT is comparable with that of standard-dose CT.

 


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  		Fig. 2A. —79-year-old man with history of colon cancer and weight of 77 kg. Contrast-enhanced CT images (mediastinal settings) using 140 kVp and 240 mAs (A) 140 kVp and 120 mAs (B) show satisfactory delineation of mediastinal structures.

 


View larger version (119K):

[in a new window]
  		Fig. 2B. —79-year-old man with history of colon cancer and weight of 77 kg. Contrast-enhanced CT images (mediastinal settings) using 140 kVp and 240 mAs (A) 140 kVp and 120 mAs (B) show satisfactory delineation of mediastinal structures.

 


View larger version (82K):

[in a new window]
  		Fig. 2C. —79-year-old man with history of colon cancer and weight of 77 kg. Contrast-enhanced CT images (lung window settings) using 140 kVp and 240 mAs (C) 140 kVp and 120 mAs (D) show satisfactory delineation of lung parenchyma and pulmonary vasculature.

 


View larger version (82K):

[in a new window]
  		Fig. 2D. —79-year-old man with history of colon cancer and weight of 77 kg. Contrast-enhanced CT images (lung window settings) using 140 kVp and 240 mAs (C) 140 kVp and 120 mAs (D) show satisfactory delineation of lung parenchyma and pulmonary vasculature.

 


View larger version (119K):

[in a new window]
  		Fig. 3A. —77-year-old man with history of colon cancer and weight of 95 kg. Contrast-enhanced CT scans (mediastinal window settings) using 140 kVp and 260 mAs (A) and 140 kVp and 130 mAs (B) show that although chest wall structures appear noisy, mediastinal structures are optimally visualized on low-dose image.

 


View larger version (119K):

[in a new window]
  		Fig. 3B. —77-year-old man with history of colon cancer and weight of 95 kg. Contrast-enhanced CT scans (mediastinal window settings) using 140 kVp and 260 mAs (A) and 140 kVp and 130 mAs (B) show that although chest wall structures appear noisy, mediastinal structures are optimally visualized on low-dose image.

 


View larger version (88K):

[in a new window]
  		Fig. 3C. —77-year-old man with history of colon cancer and weight of 95 kg. Contrast-enhanced CT scans (lung window settings) using 140 kVp and 260 mAs (C) and 40 kVp and 130 mAs (D) show satisfactory delineation of pulmonary parenchyma.

 


View larger version (88K):

[in a new window]
  		Fig. 3D. —77-year-old man with history of colon cancer and weight of 95 kg. Contrast-enhanced CT scans (lung window settings) using 140 kVp and 260 mAs (C) and 40 kVp and 130 mAs (D) show satisfactory delineation of pulmonary parenchyma.

 

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