CT Artifact Recognition for the Nuclear Technologist

Journal of Nuclear Medicine Technology

Kumar Sandrasagaren¹  Lowell Harris¹  Keith A. Kaser¹  Robert Popilock¹ 

关键词: PET/CT;    quality assurance;    SPECT/CT;    CT;    CT artifact recognition;    x-ray;   

DOI  :  10.2967/jnmt.107.047431

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

The goal of this article is to make the PET/CT and SPECT/CT operator aware of common artifacts found in CT. In diagnostic imaging, the ability to render an accurate diagnosis requires the technologist to take steps to optimize image quality and recognize when image quality has been compromisedthat is, when there is an image artifact. One way these artifacts occur is through the inability of the CT linear attenuation image to precisely represent the linear attenuation map of a 2-dimensional section through the body. The reasons for this inability are multifold. First, CT is subject to the laws of x-ray quantum physics resulting in noise in all CT images. Moreover, all current CT x-ray systems generate a spectrum of energies. Also, CT scanners use detectors of finite dimension, as are the x-ray focal spots; reconstruct images from a finite number of samples distributed over a finite number of views; and acquire the data for each reconstruction over a finite period.

【 授权许可】

Unknown