| 洪浩,耿建华,陈智文,等.源距变化对单光子发射计算机断层成像设备固有空间分辨力和固有空间线性影响的研究[J].中华放射医学与防护杂志,2024,44(12):1049-1055.Hong Hao,Geng Jianhua,Chen Zhiwen,et al.Study on impact of source distance changes on the intrinsic spatial resolution and linearity of single photon emission computed tomography equipment[J].Chin J Radiol Med Prot,2024,44(12):1049-1055 |
| 源距变化对单光子发射计算机断层成像设备固有空间分辨力和固有空间线性影响的研究 |
| Study on impact of source distance changes on the intrinsic spatial resolution and linearity of single photon emission computed tomography equipment |
| 投稿时间：2024-01-19 |
| DOI：10.3760/cma.j.cn112271-20240119-00025 |
| 中文关键词: 源距 平行狭缝铅栅模体 固有空间分辨力 固有空间线性 |
| 英文关键词:Source distance Parallel slit lead grid phantom Intrinsic spatial resolution Intrinsic spatial linearity |
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| 中文摘要: |
| 目的 研究点源到探头铅栅模体表面距离的变化对单光子发射计算机断层成像设备(SPECT)固有空间分辨力和固有空间线性的影响,为探讨质量控制性能检测方法提供参考。方法 在点源到铅栅模体表面垂直距离150、170、190、210、230 cm共5个不同位置处,使用平行狭缝铅栅模体方法对两台双探头SPECT设备(机型1、2)进行固有空间分辨力和固有空间线性指标检测。结果 两台SPECT设备双探头在被检测的5个位置图像采集完成后通过软件计算分别得出固有空间分辨力x方向、y方向的两项检测指标与固有空间线性x方向、y方向的4项检测指标波动较小,各指标范围:有效视野(UFOV)半高宽(FWHM)3.310~3.902mm、中心视野(CFOV)半高宽(FWHM)3.274~3.910mm、UFOV 微分线性0.059~0.180mm、FUOV绝对线性0.171~0.628mm、CFOV微分线性0.046~0.165mm、CFOV绝对线性0.115~0.534mm。当源距为150 cm时,固有空间分辨力略差,两台设备UFOV FWHM检测值(3.80±0.07) mm,其范围3.695~3.902 mm,CFOV FWHM检测值(3.73±0.11) mm,其范围3.572~3.910mm,但是机型1与机型2的固有空间分辨力比较,差异无统计学意义(P＞0.05),依据WS 523-2019标准,两台设备双探头固有空间分辨力和固有空间线性检测均合格。机型1与机型2的固有空间线性比较,机型1劣于机型2,差异有统计学意义(t=15.09,P＜0.001)。结论 点源到探头铅栅模体表面距离变化(150~230 cm)时,固有空间分辨力和固有空间线性未随源距而变化。在对SPECT进行固有空间分辨力和固有空间线性检测时,应保证点源到探头的垂直距离>150 cm,推荐应至少为170 cm。 |
| 英文摘要: |
| Objective To study the impact of changes in distance from the point source to the detector lead grid phantom surface on the intrinsic spatial resolution and linearity of single photon emission computed tomography equipment (SPECT), and to provide references for exploring quality control performance testing method. Methods The intrinsic spatial resolution and linearity indexes of the dual detectors of the two SPECT machines(model 1,2) were examined using the parallel slit lead grid phantom method, respectively, at five different positions of the vertical distance from the point source to the surface of the lead grid phantom, namely, 150, 170, 190, 210 and 230 cm. Results After completion of image acquisition about the two SPECT machines with dual detectors at the five positions, the software-based calculated intrinsic spatial resolution and linearity in x and y direction fluctuated both within a very small range: effective field of view half-width half-maximum 3.310-3.902 mm, central field of view half-width half-maximum 3.274-3.910 mm, UFOV differential linearity (0.059-0.180 mm), FUOV absolute linearity (0.171-0.628 mm), CFOV differential linearity (0.046-0.165 mm), CFOV absolute linearity (0.115-0.534 mm). The intrinsic spatial resolution was slightly poor at a source distance of 150 cm. The UFOV FWHM detection value of two machines was (3.80±0.07) mm, with a range of 3.695-3.902 mm. The CFOV FWHM detection value was (3.73±0.11) mm, with a range of 3.572-3.910 mm. However, no statistically significant difference was found in inherent spatial resolution between model 1 and model 2 (P>0.05). Under the WS 523-2019, the intrinsic spatial resolution and linearity of two machines with dual detectors were both qualified. The comparison of inherent spatial linearity between model 1 and model 2 showed that model 1 was inferior to model 2, with statistically significant difference (t=15.09, P＜0.001). Conclusions There was no variation in intrinsic spatial resolution and linearity with the source distance when the vertical distance from the point source to the surface of the detector lead grid phantom was changed (150 to 230 cm). When intrinsic spatial resolution and linearity testing were performed on SPECT, it is necessary to ensure that the vertical distance from the point source to the detector is greater than 150 cm and recommended to be at least 170 cm. |
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