Computational modeling of objects presented in images : fundamentals, methods, and applications : 4th International Conference, CompIMAGE 2014, Pittsburgh, PA, USA, September 3-5, 2014 : proceedings. CompIMAGE (Conference) (4th : 2014 :...最新文献

英文中文

An Inter-Projection Interpolation (IPI) Approach with Geometric Model Restriction to Reduce Image Dose in Cone Beam CT (CBCT). 基于几何模型约束的锥束CT投影插值(IPI)方法降低图像剂量。

Computational modeling of objects presented in images : fundamentals, methods, and applications : 4th International Conference, CompIMAGE 2014, Pittsburgh, PA, USA, September 3-5, 2014 : proceedings. CompIMAGE (Conference) (4th : 2014 :...

Pub Date : 2014-09-01 DOI: 10.1007/978-3-319-09994-1_2

Hong Zhang, Fengchong Kong, Lei Ren, Jian-Yue Jin

Cone beam computed tomography (CBCT) imaging is a key step in image guided radiation therapy (IGRT) to improve tumor targeting. The quality and imaging dose of CBCT are two important factors. However, X-ray scatter in the large cone beam field usually induces image artifacts and degrades the image quality for CBCT. A synchronized moving grid (SMOG) approach has recently been proposed to resolve this issue and shows great promise. However, the SMOG technique requires two projections in the same gantry angle to obtain full information due to signal blockage by the grid. This study aims to develop an inter-projection interpolation (IPI) method to estimate the blocked image information. This approach will require only one projection in each gantry angle, thus reducing the scan time and patient dose. IPI is also potentially suitable for sparse-view CBCT reconstruction to reduce the imaging dose. To be compared with other state-of-the-art spatial interpolation (called inpainting) methods in terms of signal-to-noise ratio (SNR) on a Catphan and head phantoms, IPI increases SNR from 15.3dB and 12.7dB to 29.0dB and 28.1dB, respectively. The SNR of IPI on sparse-view CBCT reconstruction can achieve from 28dB to 17dB for undersample projection sets with gantry angle interval varying from 1 to 3 degrees for both phantoms.

锥形束计算机断层扫描(CBCT)成像是图像引导放射治疗(IGRT)中提高肿瘤靶向性的关键步骤。CBCT的质量和成像剂量是两个重要因素。然而，x射线在大锥束场中的散射往往会引起图像伪影，降低CBCT的图像质量。最近提出了一种同步移动网格(SMOG)方法来解决这个问题，并显示出很大的希望。然而，由于网格的信号阻塞，烟雾技术需要在相同的龙门形角度上进行两次投影才能获得完整的信息。本研究的目的是发展一种投影插值方法来估计被遮挡的图像信息。这种方法将只需要一个投影在每个龙门形角度，从而减少扫描时间和病人的剂量。IPI也可能适用于稀疏视图CBCT重建，以减少成像剂量。为了与其他最先进的空间插值方法(称为inpainting)在Catphan和head模型上的信噪比(SNR)进行比较，IPI将信噪比分别从15.3dB和12.7dB提高到29.0dB和28.1dB。对于下样本投影集，两种幻像的门框角间隔为1 ~ 3度，IPI在稀疏视图CBCT重建上的信噪比可达到28dB ~ 17dB。

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