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- Title
Intravenous contrast injection significantly affects bone mineral density measured on CT.
- Authors
Pompe, Esther; Willemink, Martin; Dijkhuis, Gawein; Verhaar, Harald; Hoesein, Firdaus; Jong, Pim
- Abstract
Objective: The objective is to evaluate the effect of intravenous contrast media on bone mineral density (BMD) assessment by comparing unenhanced and contrast-enhanced computed tomography (CT) examinations performed for other indications. Methods: One hundred and fifty-two patients (99 without and 53 with malignant neoplasm) who underwent both unenhanced and two contrast-enhanced (arterial and portal venous phase) abdominal CT examinations in a single session between June 2011 and July 2013 were included. BMD was evaluated on the three examinations as CT-attenuation values in Hounsfield Units (HU) in the first lumbar vertebra (L1). Results: CT-attenuation values were significantly higher in both contrast-enhanced phases, compared to the unenhanced phase ( p < 0.01). In patients without malignancies, mean ± standard deviation (SD) HU-values increased from 128.8 ± 48.6 HU for the unenhanced phase to 142.3 ± 47.2 HU for the arterial phase and 147.0 ± 47.4 HU for the portal phase ( p < 0.01). In patients with malignancies, HU-values increased from 112.1 ± 38.1 HU to 126.2 ± 38.4 HU and 130.1 ± 37.3 HU ( p < 0.02), respectively. With different thresholds to define osteoporosis, measurements in the arterial and portal phase resulted in 7-25 % false negatives. Conclusions: Our study showed that intravenous contrast injection substantially affects BMD-assessment on CT and taking this into account may improve routine assessment of low BMD in nonquantitative CT. Key Points: • Routine CT may gain a role in bone attenuation measurements for osteoporosis • Contrast media injection has substantial influence on CT- derived bone density • Contrast- enhanced CT leads to underestimation of osteoporosis compared to unenhanced CT • Adjusting for contrast injection phase may improve CT screening protocols for osteoporosis.
- Subjects
BONE density; LUMBAR vertebrae; EQUALIZERS (Electronics); ARTERIAL diseases; COMPUTED tomography
- Publication
European Radiology, 2015, Vol 25, Issue 2, p283
- ISSN
0938-7994
- Publication type
Article
- DOI
10.1007/s00330-014-3408-2