Contrast Media Dosing
Conditions
Brief summary
The purpose of this study is to evaluate the effect of dosing iodinated contrast media according to a patient's total body weight vs. lean body weight. Participants will be randomized into 2 groups based on contrast dosing technique, and solid organ enhancement at uniphasic abdominal CT will be measured.
Interventions
DRUGIohexol
Iodinated contrast media
Sponsors
Nova Scotia Health Authority
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
DOUBLE (Subject, Investigator)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* outpatients only * patients scanned on modern Siemens scanners at our institution
Exclusion criteria
* self-reported history of chronic kidney, heart or liver disease * allergy to iodinated contrast * acute illness * outside maximum threshold limit for weight-based contrast dosing * pregnancy * image degradation
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Mean hepatic enhancement (MHE): difference in liver attenuation on computed tomography images acquired before and after administration of contrast (in portal venous phase), as measured in Hounsfield units (HU) | 1 hour | Images of the liver will be obtained before and after administration of iodinated contrast media. Regions of interest will be drawn on these pre- and post- contrast computed tomography (CT) images of the liver. The average attenuation before and after contrast administration will be calculated. The mean hepatic enhancement (MHE) will be calculated as the average attenuation post-contrast minus the average attenuation pre-contrast. This will provide a measure of liver enhancement. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Standard deviation in mean hepatic enhancement (sigma MHE): standard deviation in the difference in liver attenuation on CT acquired before and after administration of contrast (in portal venous phase), as measured in Hounsfield units (HU) | 1 hour | Images of the liver will be obtained before and after administration of iodinated contrast media. Regions of interest will be drawn on these pre- and post- contrast computed tomography images of the liver. The average attenuation before and after contrast administration will be calculated. The mean hepatic enhancement (MHE) will be calculated as the average attenuation post-contrast minus the average attenuation pre-contrast. The standard deviation in MHE will provide a measure of inter-patient variability. |
Countries
Canada
Outcome results
None listed