| Titel | Helical 4D-CT pitch management for the Brilliance CT Big Bore in clinical practice |
| Auteurs | G. Hilgers, T. Nuver and A. Minken |
| Aandachtsgebied | Longen, Gastro-enterologie |
| Samenvatting | In external beam radiotherapy treatment planning for patients with thoracic malignancies, respiratory-correlated CT (4D CT) is used to obtain high quality studies in the presence of respiratory motion. When helical 4D CT scans are acquired with a Brilliance CT Big Bore, the pitch must meet two conditions. It must be low enough to avoid motion artifacts, and high enough to cover the entire scan length within 120 s to prevent overheating of the X-ray tube. We developed a nomogram that can be used to obtain a suitable pitch satisfying both requirements. We also assessed the effects on the image quality of a pitch that exceeds the maximum pitch, and of a field of view (FOV) reduction. It was shown that, for AVG and MIP reconstructions, the manufacturer’s maximum pitch equation yields an underestimation due to its FOV term. |
| Datum | 2015 |
| Locatie | J Appl Clin Med Phys. 2015 in press |
| Link PubMed | Abstract |
