Target Volume Definition in Rectal Cancer: What Is the Best Imaging Modality?

摘要: All patients with rectal cancer should undergo an accurate preoperative staging, including local staging for tumour extension and reliable synchronous distant metastases. Imaging is of utmost importance as a basis selecting the optimal treatment strategies aid precise target delineation. Anatomical imaging such computed tomography (CT) magnetic resonance (MRI) have been most commonly used pretreatment modalities, whereas endorectal ultrasonography may be useful smaller tumours (T2 or lower). MRI technique T3 T4 tumours. The role fluorodeoxyglucose positron emission (PET)/CT under investigation, diffusion-weighted seems promising prediction pathological complete response. For delineation, planning CT, preferably contrast-enhanced, technique. locally advanced tumours, coregistration PET/CT prove to useful. In this article, literature published on delineation in radiotherapy evaluated, focus best modality volume definition planning.