気管食道科領域における最新の画像診断（ｈｅｌｉｃａｌ ＣＴなども含む） 気管・気管支・肺： とくに３ＤＣＴ，ＭＲＩ

Abstract

Spiral CT is a new technique that couples continuous X-ray tube rotation with a continuous table feed. It enables us to acquire a wide range of data during a single breath hold. With an uninterrupted volume of data, spiral CT provides high quality three dimensional (3D) images or Multiplanar Reconstruction (MPR) images. 3D images are useful for evaluating central airway diseases. The advantages include the following: (1) 3D images provide information on the poststenotic bronchus, which cannot be observed by bronchoscopy. (2) 3D images can assess the effect of chemotherapy or radiation therapy. (3) 3D images are useful in planning for stenting or resection. (4) 3D images can demonstrate tracheobronchial mucosal irregularity. However, intramural invasion cannot be evaluated by 3D image.In terms of spatial resolution, MRI is slightly inferior to CT. However, contrast resolutionis higher with MRI than with CT.In this paper, we will discuss the value of spiral CT and MRI in evaluating lung cancer, along with their specific advantages and disadvantages.