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Combined CT Venography and Pulmonary Angiography

How Much Venous Enhancement Is Routinely Obtained?

¹ Department of Radiology, Winthrop-University Hospital, 259 First St., Mineola, NY 11501.
² Roswell Park Cancer Institute, Elm and Carlton Sts., Buffalo, NY 14263.

View larger version (119K): [in a new window]   Fig. 1A. —Representative images from single CT venographic study for a 50-year-old woman shows levels used for measuring venous enhancement. Venographic image shows region-of-interest cursor placed in center of inferior vena cava (1). Hounsfield unit (H) measurement was 106.21 H.

View larger version (121K): [in a new window]   Fig. 1B. —Representative images from single CT venographic study for a 50-year-old woman shows levels used for measuring venous enhancement. Venographic image shows pelvis with internal iliac veins labeled 1 (113.88 H) and 2 (117.69 H).

View larger version (103K): [in a new window]   Fig. 1C. —Representative images from single CT venographic study for a 50-year-old woman shows levels used for measuring venous enhancement. Venographic image shows lower pelvis with common femoral veins labeled 1 (127.33 H) and 2 (119.21 H).

View larger version (57K): [in a new window]   Fig. 1D. —Representative images from single CT venographic study for a 50-year-old woman shows levels used for measuring venous enhancement. Venographic image shows thighs with superficial femoral veins labeled 1 (127.20 H) and 2 (127.82 H).

View larger version (44K): [in a new window]   Fig. 1E. —Representative images from single CT venographic study for a 50-year-old woman shows levels used for measuring venous enhancement. Venographic image obtained at level of distal femurs shows proximal popliteal veins labeled as 1 (127.56 H) and 2 (112.90 H).

View larger version (15K): [in a new window]   Fig. 2A. —Range and distribution of all Hounsfield unit measurements at each venous level for all 429 CT venographic examinations (number of examinations shown on y-axes, Hounsfield measurement levels on x-axes; measurements for right shown in white, for left and for vena cava in black). Note that measurements are 61-140 H for most CT examinations at all venous stations. Range and distribution of Hounsfield unit measurements for inferior vena cava (A), for right and left iliac veins (B), for right and left common femoral veins (C), for right and left superficial femoral veins (D), and for right and left popliteal veins (E).

View larger version (18K): [in a new window]   Fig. 2B. —Range and distribution of all Hounsfield unit measurements at each venous level for all 429 CT venographic examinations (number of examinations shown on y-axes, Hounsfield measurement levels on x-axes; measurements for right shown in white, for left and for vena cava in black). Note that measurements are 61-140 H for most CT examinations at all venous stations. Range and distribution of Hounsfield unit measurements for inferior vena cava (A), for right and left iliac veins (B), for right and left common femoral veins (C), for right and left superficial femoral veins (D), and for right and left popliteal veins (E).

View larger version (17K): [in a new window]   Fig. 2C. —Range and distribution of all Hounsfield unit measurements at each venous level for all 429 CT venographic examinations (number of examinations shown on y-axes, Hounsfield measurement levels on x-axes; measurements for right shown in white, for left and for vena cava in black). Note that measurements are 61-140 H for most CT examinations at all venous stations. Range and distribution of Hounsfield unit measurements for inferior vena cava (A), for right and left iliac veins (B), for right and left common femoral veins (C), for right and left superficial femoral veins (D), and for right and left popliteal veins (E).

View larger version (18K): [in a new window]   Fig. 2D. —Range and distribution of all Hounsfield unit measurements at each venous level for all 429 CT venographic examinations (number of examinations shown on y-axes, Hounsfield measurement levels on x-axes; measurements for right shown in white, for left and for vena cava in black). Note that measurements are 61-140 H for most CT examinations at all venous stations. Range and distribution of Hounsfield unit measurements for inferior vena cava (A), for right and left iliac veins (B), for right and left common femoral veins (C), for right and left superficial femoral veins (D), and for right and left popliteal veins (E).

View larger version (19K): [in a new window]   Fig. 2E. —Range and distribution of all Hounsfield unit measurements at each venous level for all 429 CT venographic examinations (number of examinations shown on y-axes, Hounsfield measurement levels on x-axes; measurements for right shown in white, for left and for vena cava in black). Note that measurements are 61-140 H for most CT examinations at all venous stations. Range and distribution of Hounsfield unit measurements for inferior vena cava (A), for right and left iliac veins (B), for right and left common femoral veins (C), for right and left superficial femoral veins (D), and for right and left popliteal veins (E).

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