Salkica Nusret, Begic Amela, Zubovic Sandra, Ceric Sejla, Basic Amila, Sehic Adnan, Julardzija Fuad, Tinjak Enis
Clinic for Nuclear Medicine, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina.
Radiology Clinic, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina.
Acta Inform Med. 2022 Mar;30(1):36-40. doi: 10.5455/aim.2022.30.36-40.
The use of resolution recovery (RR) in bone and myocardial perfusion imaging is becoming increasingly popular in nuclear medicine departments. RR produces reconstructed images that show improved spatial resolution and signal-to-noise ratio compared with conventional single-photon emission computed tomography (SPECT) images.
To evaluate the impact of the ordered subset expectation maximization (OSEM) RR modality on preserving noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) for short SPECT acquisition.
This prospective study was conducted on 80 patients. Full SPECT acquisition was performed as a standardized protocol, while reduced acquisition was achieved with the Poisson resampling method. Noise, SNR, and CNR were measured for different reconstruction parameters for the same image levels. The impact of surface area and body mass index was also measured for the same reconstruction parameters.
The results show significantly higher SNR and CNR for the Evolution for Bone protocol compared to the other two reconstruction protocols for full and reduced SPECT acquisition. With the shortening of the SPECT acquisition, an increase in the value of noise was recorded. SNR and CNR decreased with the reduction in SPECT acquisition.
The Evolution for Bone protocol for all three analyzed acquisition protocols had the lowest noise values. The highest SNR and CNR were recorded in the Evolution for Bone protocol for the three acquisition protocols and SPECT acquisition time can be reduced from 20 to 10 min for bone SPECT.
分辨率恢复（RR）技术在骨与心肌灌注成像中的应用在核医学科室越来越普遍。与传统单光子发射计算机断层扫描（SPECT）图像相比，RR技术生成的重建图像具有更高的空间分辨率和信噪比。
评估有序子集期望最大化（OSEM）RR模式对短时间SPECT采集时噪声、信噪比（SNR）和对比噪声比（CNR）的影响。
本前瞻性研究纳入80例患者。按照标准化方案进行全SPECT采集，同时采用泊松重采样法进行减少采集。在相同图像水平下，针对不同重建参数测量噪声、SNR和CNR。对于相同的重建参数，还测量了表面积和体重指数的影响。
结果显示，与全SPECT采集和减少采集的其他两种重建方案相比，骨显像的Evolution方案具有显著更高的SNR和CNR。随着SPECT采集时间缩短，噪声值增加。SNR和CNR随着SPECT采集的减少而降低。
在所有三种分析的采集方案中，骨显像的Evolution方案噪声值最低。在三种采集方案中，骨显像的Evolution方案记录到最高的SNR和CNR，并且骨SPECT的采集时间可以从20分钟减少到10分钟。
