Opportunistic CT: Difference between revisions
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<sup>1</sup>Conference of Radiation Control Program Directors (CRCPD) Nationwide Evaluation of X-ray Trends (NEXT) 2005-2006 report (https://crcpd.org/document/nationwide-evaluation-of-x-ray-trends-next-tabulation-and-graphical-summary-of-the-2005-2006-survey-of-computed-tomography/) | <sup>1</sup>Conference of Radiation Control Program Directors (CRCPD) Nationwide Evaluation of X-ray Trends (NEXT) 2005-2006 report (https://crcpd.org/document/nationwide-evaluation-of-x-ray-trends-next-tabulation-and-graphical-summary-of-the-2005-2006-survey-of-computed-tomography/) | ||
<sup>2</sup>CRCPD, Publication E-07-2, Tabulation and Graphical Summary of 2000 Survey of Computed Tomograph, (NEXT), August, 2007 | |||
<sup>3</sup>Biswas et al. Radiation Exposure from Musculoskeletal Computerized Tomographic Scans. The Journal of Bone and Joint Surgery, 2009. | |||
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Revision as of 00:14, 2 March 2025
Radiation Dose
X-rays are a form of energy – like light and radio waves. X-rays are also called radiation. Unlike light waves, x-rays have enough energy to pass through your body. As the radiation moves through your body, it passes through bones, tissues, and organs differently. This allows a radiologist to create images of them. The radiologist is a specially trained doctor who can examine these images on a computer display. X-rays allow the radiologist to see the structures in your body in very fine detail.
Dose Length Product
Dose length product (DLP) is a measure of CT tube radiation output/exposure (measured in mGy.cm). It is related to volume CT dose index (CTDIvol), but CTDIvol represents the dose through a slice of an appropriate phantom. The dose length product accounts for the length of radiation output along the z-axis (the long axis of the patient). It may be described by the following equation:
DLP = (CTDIvol in mGy) . (length of scan in cm)
The dose length product does not take the size of the patient into account and is not a measure of absorbed dose. If the AP and lateral dimensions of the patient are available, then the size specific dose estimate (SSDE) can be used to estimate the absorbed dose.
Effective Dose
Some estimates of effective dose are summarized in the table below, taken from the cited sources.
| Scan | Effective Dose (mSv) |
|---|---|
| Head | 2.2 |
| Full Spine | 20.6 |
| Cervical | 3.6 |
| Thoracic | 12.0 |
| Lumbar | 5.0 |
| Chest | 6.0 |
| Chest/Abdo/Pelvis | 19.0 |
| Abdo/Pelvis | 15.6 |
| Knees | 0.16 |
| Ankles | 0.14 |
1Conference of Radiation Control Program Directors (CRCPD) Nationwide Evaluation of X-ray Trends (NEXT) 2005-2006 report (https://crcpd.org/document/nationwide-evaluation-of-x-ray-trends-next-tabulation-and-graphical-summary-of-the-2005-2006-survey-of-computed-tomography/)
2CRCPD, Publication E-07-2, Tabulation and Graphical Summary of 2000 Survey of Computed Tomograph, (NEXT), August, 2007
3Biswas et al. Radiation Exposure from Musculoskeletal Computerized Tomographic Scans. The Journal of Bone and Joint Surgery, 2009.
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Calibration
Do some more stuff about calibration.