Regarding the CT dose index (CTDI): a. CTDIvol is measured in mGy b.

1.	Regarding the CT dose index (CTDI): a. CTDIvol is measured in mGy b. For measurement of the weighted CTDI (CTDIw) for body scanning, a 16 cm diameter phantom is used c. The EDLP (normalized effective dose) is measured in mSv mGy-1 cm d. The effective dose in CT can be calculated using ionizing chambers e. If CTDIw (body) is 10 mGy per 100 mAs; for imaging 25 cm of chest with 150 mAs and a pitch of 1.25, the DLP would be 300 mGy cm
Answer» a. False. b. False. A 16 cm diameter phantom is used for the head and a 32 cm diameter phantom is used for the body. c. False. E_DLP is measured in mSv mGy^-1 cm^-1 . The effective dose is derived from E_DLP x DLP. d. False. Effective doses in CT can be calculated using special computer programs. A special ionization chamber detector is used to measure CTDI. e. True. DLP: CTDI_w x 1/pitch x length; therefore, CTDI_w for 150 mAs is 15 mGy = 15 1/1.25 25 = 300 mGy cm.

Regarding the CT dose index (CTDI): a. CTDIvol is measured in mGy b. For measurement of the weighted CTDI (CTDIw) for body scanning, a 16 cm diameter phantom is used c. The EDLP (normalized effective dose) is measured in mSv mGy-1 cm d. The effective dose in CT can be calculated using ionizing chambers e. If CTDIw (body) is 10 mGy per 100 mAs; for imaging 25 cm of chest with 150 mAs and a pitch of 1.25, the DLP would be 300 mGy cm

Answer»

a. False.

b. False. A 16 cm diameter phantom is used for the head and a 32 cm diameter phantom is used for the body.

c. False. E_DLP is measured in mSv mGy^-1 cm^-1 . The effective dose is derived from E_DLP x DLP.

d. False. Effective doses in CT can be calculated using special computer programs. A special ionization chamber detector is used to measure CTDI.

e. True. DLP: CTDI_w x 1/pitch x length; therefore, CTDI_w for 150 mAs is 15 mGy = 15 1/1.25 25 = 300 mGy cm.

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