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Simulation Study of Clinical PET Scanners With Different Geometries, Including TOF and DOI Capabilities 不同几何结构(包括 TOF 和 DOI 功能)的临床 PET 扫描仪模拟研究
IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-02-14 DOI: 10.1109/TRPMS.2024.3365911
Gabriel Cañizares;Santiago Jiménez-Serrano;Alejandro Lucero;Constantino Morera-Ballester;Enrique Muñoz;José M. Benlloch;Antonio J. González
Total body positron emission tomography (TB-PET) scanners provide high-quality images due to the large sensitivity. Our motivation is to design a TB-PET system with up to 70 cm axial coverage that mitigates the parallax error degradation by using a detector concept based on semi-monolithic LYSO crystals. Furthermore, this detector approach allows to simultaneously reach an accurate coincidence time resolution (CTR) to enhance the image quality by means of time-of-flight (TOF) reconstruction algorithms. We have simulated and compared two positron emission tomography (PET) prototypes with about 70 cm but a different number of detector rings (7 versus 5). The NEMA NU 2 2018 protocol has been implemented. By correcting the parallax error with the depth-of-interaction (DOI) information, the spatial resolution remains homogeneous and below 3 mm in the entire field of view (FOV), differently from designs based on pixelated crystals. The sensitivity reaches values of 58 and 115 cps/kBq, for the 5 and 7 rings configurations, respectively. The noise equivalent count rate (NECR) was found at 563 kcps/mL. This value is lower than other systems, most likely due to the requirement to process a larger number of channels to characterize the DOI. Percent contrasts obtained for two different phantoms are in general beyond 80% for the largest spheres, nearly 100% for the 7 rings configuration once TOF is applied during the reconstruction process. In conclusion, although the sensitivity and NECR results for the 5-rings configuration are lower compared to the 7-rings approach, its overall performance is enhanced by the addition of TOF and parallax error correction, improving that of conventional Whole Body PET scanners (axial length: 20–30 cm) in terms of image quality.
全身正电子发射断层扫描(TB-PET)具有高灵敏度,可提供高质量的图像。我们的动机是设计一种轴向覆盖范围达 70 厘米的 TB-PET 系统,通过使用基于半单片 LYSO 晶体的探测器概念来减轻视差误差的衰减。此外,这种探测器方法还能同时达到精确的重合时间分辨率(CTR),从而通过飞行时间(TOF)重建算法提高图像质量。我们模拟并比较了两个正电子发射断层扫描(PET)原型,它们的距离约为 70 厘米,但探测器环的数量不同(7 对 5)。我们采用了 NEMA NU 2 2018 协议。通过使用相互作用深度(DOI)信息校正视差误差,空间分辨率保持均匀,在整个视场(FOV)中低于 3 毫米,这与基于像素化晶体的设计不同。5 环和 7 环配置的灵敏度分别达到 58 和 115 cps/kBq。噪声等效计数率(NECR)为 563 kcps/mL。该值低于其他系统,很可能是由于需要处理更多通道以确定 DOI 的特征。在重建过程中应用 TOF 后,两种不同模型获得的对比度百分比对于最大的球体一般超过 80%,对于 7 环配置则接近 100%。总之,虽然与 7 环方法相比,5 环配置的灵敏度和 NECR 结果较低,但通过添加 TOF 和视差误差校正,其整体性能得到了提高,在图像质量方面比传统的全身 PET 扫描仪(轴向长度:20-30 厘米)更胜一筹。
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引用次数: 0
Stability of Radiomic Models and Strategies to Enhance Reproducibility 辐射模型的稳定性和提高可重复性的策略
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-13 DOI: 10.1109/TRPMS.2024.3365778
Ahmad Chaddad;Xiaojuan Liang
Radiomics is a progressive field aiming to quantitatively assess the diversity within and between tumors using image analysis. It holds tremendous promise for tracking tumor treatment progress over time. This review summarizes recent advances in ensuring the stability, repeatability, and reproducibility of radiomic analyses. It covers various factors influencing the radiomics process and potential variables that can affect stability. The study also proposes strategies to enhance the reliability of both radiomic features and models. Additionally, we highlight the importance of stability in each radiomic phase to achieve the cut-off stable model. Moreover, we discuss the details of using the radiomics quality score (RQS) to evaluate radiomics research, guiding researchers in formulating reasonable research designs to promote more stable radiomic models.
放射组学是一个进步的领域,旨在利用图像分析对肿瘤内部和肿瘤之间的多样性进行定量评估。随着时间的推移,它在跟踪肿瘤治疗进展方面大有可为。本综述总结了在确保放射组学分析的稳定性、可重复性和再现性方面的最新进展。它涵盖了影响放射组学过程的各种因素以及可能影响稳定性的潜在变量。研究还提出了提高放射组学特征和模型可靠性的策略。此外,我们还强调了每个放射组学阶段的稳定性对实现临界稳定模型的重要性。此外,我们还讨论了使用放射组学质量评分(RQS)评估放射组学研究的细节,指导研究人员制定合理的研究设计,以促进更稳定的放射组学模型。
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引用次数: 0
Performance Comparison of DOI-Encoding PET Detectors Based on 1.1-mm Pitch BGO Arrays With Different Reflectors 基于 1.1 毫米间距 BGO 阵列的 DOI 编码 PET 探测器与不同反射器的性能比较
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-05 DOI: 10.1109/TRPMS.2024.3361891
Junwei Du;Shixian Du
Bismuth germanate (BGO)-based positron emission tomography (PET) detectors are potential candidates for low-dose imaging PET scanners, owing to the high stopping power and low background radiation of BGO. In this article, we compared the performance of two dual-ended readout PET detectors based on $15times15$ BGO arrays. Both arrays had the same 1.1 mm pitch but utilized different reflectors—barium sulfate (BaSO4) and enhanced specular reflector film (ESR)—for high-resolution PET applications. The detectors were constructed with Hamamatsu 13361–2050-08 silicon photomultiplier arrays. Each BGO element had dimensions of $1.02times 1.02times20$ mm3. The lateral surfaces of the BGO elements were unpolished (saw-cut), while the two ends were polished. Flood histograms showed that the detector based on the BGO array with BaSO4 reflector had much better crystal identification and depth-of-interaction (DOI) resolution. Specifically, the energy, DOI, and timing resolutions for the detector using the BGO array with BaSO4 reflector were 19.8 ± 1.5%, 4.13 ± 0.48 mm, and 2.80 ± 0.23 ns, respectively. In contrast, the values obtained using the BGO array with ESR reflector were 20.9 ± 2.1%, 7.69 ± 1.92 mm, and 2.93 ± 0.20 ns, respectively.
基于锗酸铋(BGO)的正电子发射断层扫描(PET)探测器是低剂量成像 PET 扫描仪的潜在候选探测器,因为 BGO 具有高阻断能力和低本底辐射。在本文中,我们比较了基于 $15times15$ BGO 阵列的两种双端读出 PET 探测器的性能。这两种阵列具有相同的 1.1 毫米间距,但使用了不同的反射器--硫酸钡 (BaSO4) 和增强镜面反射膜 (ESR)--用于高分辨率 PET 应用。探测器采用 Hamamatsu 13361-2050-08 硅光电倍增管阵列。每个 BGO 元件的尺寸为 1.02×times 1.02×times20$ mm3。BGO 元件的侧表面未经抛光(锯切),而两端经过抛光。泛洪直方图显示,基于 BGO 阵列和 BaSO4 反射器的探测器具有更好的晶体识别能力和相互作用深度(DOI)分辨率。具体来说,使用带有 BaSO4 反射器的 BGO 阵列的探测器的能量、DOI 和时间分辨率分别为 19.8 ± 1.5%、4.13 ± 0.48 mm 和 2.80 ± 0.23 ns。相比之下,使用带有 ESR 反射器的 BGO 阵列获得的数值分别为 20.9 ± 2.1%、7.69 ± 1.92 mm 和 2.93 ± 0.20 ns。
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引用次数: 0
IEEE Data Port IEEE 数据端口
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-02 DOI: 10.1109/TRPMS.2024.3357949
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引用次数: 0
Member Get-A-Member (MGM) Program 会员注册(MGM)计划
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-02 DOI: 10.1109/TRPMS.2024.3355538
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引用次数: 0
IEEE Transactions on Radiation and Plasma Medical Sciences Information for Authors 电气和电子工程师学会《辐射与等离子体医学科学杂志》作者须知
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-02 DOI: 10.1109/TRPMS.2024.3355531
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引用次数: 0
IEEE Transactions on Radiation and Plasma Medical Sciences Publication Information 电气和电子工程师学会辐射与等离子体医学科学杂志》(IEEE Transactions on Radiation and Plasma Medical Sciences)出版信息
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-02-02 DOI: 10.1109/TRPMS.2024.3355533
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引用次数: 0
DOI- and TOF-Capable PET Array Detector Using Double-Ended Light Readout and Stripline-Based Row and Column Electronic Readout 利用双端光读出和基于条带的行列电子读出,可实现 DOI 和 TOF 功能的 PET 阵列探测器
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-01-31 DOI: 10.1109/TRPMS.2024.3360942
Fei Wang;Chien-Min Kao;Xiaoyu Zhang;Linfeng Liu;Yuexuan Hua;Heejong Kim;Woon-Seng Choong;Qingguo Xie
We investigate a highly multiplexing readout for depth-of-interaction (DOI) and time-of-flight PET detector consisting of an $Ntimes N$ crystals whose light outputs at the front and back ends are detected by using silicon photomultipliers (SiPMs). The front $Ntimes N$ SiPM array is read by using a stripline (SL) configured to support discrimination of the row position of the signal-producing crystal. The back $Ntimes N$ SiPM array is similarly read by an SL for column discrimination. Hence, the detector has only four outputs. We built $4times4$ and $8times8$ detector modules (DMs) by using 3.0-mm $^{3},,times3.0$ -mm $^{3},,times20$ -mm3 lutetium-yttrium oxyorthosilicates. The outputs were sampled and processed offline. For both DMs, crystal discrimination was successful. For the 4 $times $ 4 DM, we obtained an average energy resolution (ER) of 14.1%, an average DOI resolution of 2.5 mm, a non DOI-corrected coincidence resolving time (CRT), measured in coincidence with a single-pixel reference detector (refDet), of about 495ps. For the 8 $times $ 8 DM, the average ER, average DOI resolution and average CRT were 16.4%, 2.9 mm, and 641ps, respectively. We identified the intercrystal scattering as a probable cause for the CRT deterioration when the DM was increased from 4 $times $ 4 to 8 $times $ 8.
我们研究了一种用于交互深度(DOI)和飞行时间 PET 检测器的高复用读出装置,该装置由 N 次 N 元晶体组成,其前后端的光输出通过硅光电倍增管(SiPM)进行检测。前端 N 次 N 个硅光电倍增管阵列通过使用条纹线(SL)读取,条纹线的配置支持对产生信号的晶体的行位置进行区分。后面的 N/times N$ SiPM 阵列同样也是通过一个 SL 来读取,以进行列分辨。因此,检测器只有四个输出。我们使用 3.0mm $^{3}times3.0$ -mm $^{3}times20$ -mm3 镥钇氧硅酸盐制造了 $4times4$ 和 $8times8$ 的探测器模块(DM)。对输出结果进行了采样和离线处理。对于两种 DM,晶体辨别都很成功。对于 4 倍的 4 DM,我们获得的平均能量分辨率(ER)为 14.1%,平均 DOI 分辨率为 2.5 mm,非 DOI 校正的重合分辨时间(CRT)(与单像素参考探测器(refDet)重合测量)约为 495ps。对于 8 $times $ 8 DM,平均 ER、平均 DOI 分辨率和平均 CRT 分别为 16.4%、2.9 mm 和 641ps。当DM从4乘以4增加到8乘以8时,我们发现晶间散射可能是CRT恶化的原因。
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引用次数: 0
A Novel Peak Picking Multi-Voltage Threshold Digitizer for Pulse Sampling 用于脉冲采样的新型峰值采集多电压阈值数字转换器
IF 4.4 Q1 Physics and Astronomy Pub Date : 2024-01-29 DOI: 10.1109/TRPMS.2024.3359241
Yiqing Ling;Ao Qiu;Lin Wan;Fei Wang;Kezhang Zhu;Yeping Zhang;Qingguo Xie
The multi-voltage threshold (MVT) method employs comparators and time-to-digital converters to acquire the samples of a scintillation pulse when it crosses voltage thresholds and recovers the pulse using a prior model. It serves as a versatile pulse digitizing method in particle physics applications, including positron emission tomography (PET) and proton therapy verification. In these applications, the performance of the MVT method is sensitive to voltage threshold settings, leading to deteriorating energy resolution (ER) if the voltage thresholds are not selected for optimized pulse recovery. In this article, we propose a peak-picking MVT (PP-MVT) method that acquires the time and voltage of a pulse peak and recovers the pulse with MVT samples and peak information. Based on a dataset acquired from an LYSO/SiPM PET detector, we evaluate the performance of the two methods under four typical voltage threshold settings. The results show that the worst ER achieved by this method is 13.2%@511 keV, while that achieved by the MVT method is 16.3%@511 keV. Moreover, we implement a preliminary 1-channel peak-picking circuit, which has successfully captured the peak voltages of scintillation pulses. Based on this circuit, we are currently developing a 36-channel PP-MVT digitizer, where the readout unit is multiplexed, thus improving the ER of PET systems with little extra hardware complexity.
多电压阈值(MVT)方法利用比较器和时间数字转换器,在闪烁脉冲越过电压阈值时采集其样本,并利用先前的模型恢复脉冲。它是粒子物理学应用中的一种多功能脉冲数字化方法,包括正电子发射断层扫描(PET)和质子治疗验证。在这些应用中,MVT 方法的性能对电压阈值设置很敏感,如果没有选择优化脉冲恢复的电压阈值,就会导致能量分辨率(ER)下降。在本文中,我们提出了一种采峰 MVT(PP-MVT)方法,它能获取脉冲峰值的时间和电压,并利用 MVT 样本和峰值信息恢复脉冲。基于从 LYSO/SiPM PET 探测器获取的数据集,我们评估了两种方法在四种典型电压阈值设置下的性能。结果表明,该方法实现的最差ER为13.2%@511 keV,而MVT方法实现的最差ER为16.3%@511 keV。此外,我们还初步实现了一个单通道峰值拾取电路,成功捕捉到了闪烁脉冲的峰值电压。在此电路的基础上,我们目前正在开发一个 36 通道 PP-MVT 数字转换器,其中的读出单元是多路复用的,从而以很小的额外硬件复杂性提高了 PET 系统的 ER。
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引用次数: 0
Activity Alterations of 37 Tyrosine Kinase Inhibitors Upon kINPen Plasma Exposure in A549 Lung Cancer Cells 37 种酪氨酸激酶抑制剂在 A549 肺癌细胞中暴露于 kINPen 血浆后的活性变化
IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-01-24 DOI: 10.1109/TRPMS.2024.3355331
P. Schulan;M. Wende;S. Bekeschus;M. Lalk;K. Wende
Cold physical plasma shows promising preclinical results as an anticancer strategy. The technology generates a variety of reactive oxygen species (ROS) mediating gas plasma-induced effects in cells and tissues. On the cellular level, ROS can trigger oxidative stress-related responses. On the biomolecular level, ROS can introduce oxidative modifications, potentially leading to functional alterations. To better understand plasma treatment in oncology therapies, we treated tyrosine kinase inhibitors (TKIs) with plasma to investigate the efficacy upon oxidation as well as plasma pretreated A549 lung cancer cells before TKI treatment to investigate combination effects. Specifically, a library of 37 compounds was exposed to the atmospheric pressure argon plasma jet kINPen before being added to the cells. Most gas plasma-treated TKIs showed a significant decline in anticancer efficacy. The experimental compound NVP-AEW541 showed elevated tumor-toxic effects after exposure to gas plasma. In A549 cells pretreated with gas plasma, all TKIs but one showed additive toxicity. In summary, this first study on gas plasma treatment of TKIs and lung cancer cells in combination treatments revealed that direct gas plasma TKI treatment decreased the activity of most but not all compounds investigated, while gas plasma pretreated cells mostly showed additive toxicity in response to TKI exposure.
冷物理等离子体作为一种抗癌策略,在临床前已取得了可喜的成果。该技术会产生多种活性氧(ROS),介导气体等离子体在细胞和组织中的诱导效应。在细胞层面,ROS 可引发氧化应激相关反应。在生物分子层面,ROS 可引入氧化修饰,从而可能导致功能改变。为了更好地了解肿瘤疗法中的血浆治疗,我们用血浆处理酪氨酸激酶抑制剂(TKIs),研究氧化后的疗效,并在TKI治疗前用血浆预处理A549肺癌细胞,研究联合效应。具体来说,在将 37 种化合物加入细胞之前,先将它们暴露在常压氩气等离子喷射器 kINPen 中。大多数经气体等离子体处理的 TKI 抗癌效果明显下降。实验性化合物 NVP-AEW541 在暴露于气体等离子体后显示出更高的肿瘤毒性效应。在用气体等离子体预处理的 A549 细胞中,除了一种 TKIs 外,所有 TKIs 都显示出相加毒性。总之,这项关于气体等离子体处理 TKIs 和肺癌细胞联合治疗的首次研究表明,直接用气体等离子体处理 TKI 会降低大多数(而非所有)受试化合物的活性,而气体等离子体预处理细胞大多会对 TKI 暴露表现出相加毒性。
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引用次数: 0
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IEEE Transactions on Radiation and Plasma Medical Sciences
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