Physica Medica-European Journal of Medical Physics最新文献

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SC13.06 INTERNATIONAL COMPARISON OF VMAT TREATMENT PLANS FOR A CHALLENGING CASE OF WHOLE BREAST WITH AXILLARY, SUPRACLAVICULAR AND INTRAMAMMARY LYMPH NODES AND A SIMULTANEOUS INTEGRATED BOOST SC13.06 对带有腋窝、锁骨上和乳腺内淋巴结的全乳腺挑战性病例以及同时综合增强的 Vmat 治疗方案进行国际比较

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103480

引用次数: 0

SC03.02 MOTION DEPENDENCE OF MAGNETIC RESONANCE THERMOMETRY PRECISION DURING DEEP-REGIONAL HYPERTHERMIA TREATMENT IN THE PELVIS AND EXTREMITIES SC03.02 骨盆和四肢深区域热疗期间磁共振温度测量精度的运动依赖性

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103441

引用次数: 0

SC08.02 A BIOKINETIC MODEL FOR RADON IN PREGNANCY sc08.02 妊娠期氡的生物动力学模型

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103462

引用次数: 0

SC05.06 STATISTICAL PROCESS CONTROL ANALYSIS GUIDES ADAPTIVE RADIOTHERAPY DECISIONS IN NASOPHARYNGEAL CARCINOMA PATIENTS SC05.06 统计过程控制分析指导鼻咽癌患者的适应性放疗决策

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103451

引用次数: 0

SC01.03 BLOOD DOSE AND CORRELATIONS WITH CLINICAL OUTCOMES IN BRAIN AND HEAD-AND-NECK CANCER sc01.03 脑癌和头颈癌的血液剂量及其与临床结果的相关性

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103436

引用次数: 0

SC07.02 SINGLE-SITE REPRODUCIBILITY IN PULSEQ-DESIGNED MR FINGERPRINTING SEQUENCES SC07.02 脉冲q设计的MR指纹序列的单点重现性

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103457

引用次数: 0

SC17.05 PREDICTIVE DOSIMETRIC AND CLINICAL PARAMETERS FOR CLINICAL OUTCOMES IN SINGLE-ISOCENTER LINAC-BASED RADIOSURGERY FOR SINGLE AND MULTIPLE BRAIN METASTASES SC17.05 单中心直列加速器放射外科治疗单发和多发脑转移瘤临床结果的预测剂量学和临床参数

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103491

引用次数: 0

SC07.03 QUANTITATIVE ANALYSIS OF RADIOMIC FEATURES IN mMRI FOR PROSTATE CANCER CHARACTERIZATION SC07.03 用于诊断前列腺癌的 mMRI 放射特征定量分析

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.103458

引用次数: 0

Feasibility of the analytical dose calculation method for Au-198 brachytherapy 金-198 近距离放射治疗剂量分析计算方法的可行性

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.104501

Purpose

A dose calculation algorithm Computed Tomography (CT)-based analytical dose calculation method (CT_anly), which can correct for subject inhomogeneity and size-dependent scatter doses, was applied to the ¹⁹⁸Au seed. In this study, we evaluated the effectiveness of the CT_anly method by comparing the gold standard Monte Carlo (MC) method and the conventional TG43 method on two virtual phantoms and patient CT images simulating oral cancer.

Methods

As virtual phantoms, a water phantom and a heterogeneous phantom with soft tissue inserted cubic fat, lung, and bone were used. A 2-mm-thick lead plate was also inserted into the heterogeneous phantom as a dose attenuator. Virtual ¹⁹⁸Au seeds and a 2-mm-thick lead plate were placed on the patient CT images. Dose distributions obtained via the TG43 and CT_anly methods were compared with those of the MC by gamma analysis with 2%/2-mm thresholds. The computation durations were also compared.

Results

In the water phantom, dose distributions comparable to those obtained via the MC method were obtained regardless of the algorithm. For the inhomogeneity phantom and patient case, the CT_anly method showed an improvement in the gamma passing rate and dose distributions similar to those of the MC method were obtained. The computation time, which was days with the MC method, was reduced to minutes with the CT_anly method.

Conclusions

The CT_anly method is effective for ¹⁹⁸Au seed dose calculations and takes a shorter time to obtain the dose distributions than the MC method.

目的一种剂量计算算法基于计算机断层扫描（CT）的分析剂量计算方法（CTanly）被应用于 198Au 种子，该方法可以校正受试者的不均匀性和与尺寸相关的散射剂量。在这项研究中，我们在两个虚拟模型和模拟口腔癌的患者 CT 图像上比较了金标准蒙特卡罗（MC）方法和传统的 TG43 方法，评估了 CTanly 方法的有效性。异质模型中还插入了一块 2 毫米厚的铅板作为剂量衰减器。在患者 CT 图像上放置了虚拟 198Au 种子和 2 毫米厚的铅板。在 2%/2 毫米阈值下，通过伽马分析将 TG43 和 CTanly 方法获得的剂量分布与 MC 方法的剂量分布进行了比较。结果在水模型中，无论采用哪种算法，都能获得与 MC 方法相当的剂量分布。对于不均匀模型和患者病例，CTanly 方法提高了伽马通过率，得到的剂量分布与 MC 方法相似。结论 CTanly 方法对 198Au 种子剂量计算很有效，与 MC 方法相比，它能在更短的时间内获得剂量分布。

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引用次数: 0

Analysis of intra-fractional positioning correction performed by cone beam computed tomography in SBRT treatments 锥形束计算机断层扫描在 SBRT 治疗中进行的点内定位校正分析

IF 3.3 3区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Physica Medica-European Journal of Medical Physics

Pub Date : 2024-09-01 DOI: 10.1016/j.ejmp.2024.104502

Purpose

This study aims to evaluate the positioning correction extracted from Intra-fraction Cone Beam (IF-CBCT) images obtained during Stereotactic Body Radiotherapy (SBRT) treatments, and to assess whether its magnitude justifies its acquisition. In addition, the results obtained in lung, liver, and pancreas SBRTs with two deep inspiration breath-hold systems (DIBH), and for prostate with/without ultrasound (US) monitoring were compared.

Methods

1449 treatments, performed with two linear accelerators (LINACs) were retrospectively analyzed. DIBH were performed either with a spirometry-based device or a surface-guidance system and one LINAC was equipped with US monitoring system for prostate. Significance tests were used to account for differences between units.

Results

Group systematic error (M) was approximately –0.7 mm for DIBH treatments in superior-inferior (SI) direction with no difference (p > 0.7) between LINACs. Moreover, there was a SI difference of 0.5 mm for prostate treatments (p = 0.008), in favor of the US monitored one. In anterior-posterior (AP) direction, only liver treatments exhibited differences between LINACs, with the spirometer-based system being 0.8 mm inferior (p = 0.003). M<0.4 mm in left–right (LR) direction was found for all locations and LINACs. The spirometer-based system resulted in lower standard deviation of systematic and random errors in most components and locations, with a greater effect observed in liver SBRTs.

Conclusions

The corrections made with IF-CBCT during SBRT treatments were not negligible. Both DIBH systems were effective in managing respiratory movements. However, the spirometry-based system was slightly more accurate. In addition, US monitoring of the prostate appeared to be useful in reducing target shift.

目的本研究旨在评估从立体定向体部放射治疗（SBRT）过程中获得的椎间盘内锥形束（IF-CBCT）图像中提取的定位校正，并评估其大小是否证明其采集是合理的。此外，还比较了使用两种深吸气屏气系统（DIBH）进行肺、肝和胰腺 SBRT 治疗的结果，以及使用/不使用超声波（US）监测进行前列腺治疗的结果。DIBH使用基于肺活量的设备或表面引导系统进行，其中一台LINAC配备了前列腺US监测系统。结果在上-下（SI）方向上，DIBH治疗的组系统误差（M）约为-0.7毫米，LINAC之间无差异（p >0.7）。此外，前列腺治疗的 SI 差异为 0.5 毫米（p = 0.008），而 US 监测的前列腺治疗的 SI 差异更大。在前后（AP）方向上，只有肝脏治疗显示出 LINAC 之间的差异，基于肺活量计的系统差 0.8 毫米（p = 0.003）。所有位置和 LINAC 在左右（LR）方向的误差均为 0.4 毫米。基于肺活量计的系统使大多数组件和位置的系统误差和随机误差的标准偏差更低，在肝脏 SBRT 中观察到的效果更大。两种 DIBH 系统都能有效控制呼吸运动。不过，基于肺活量测定的系统要稍微准确一些。此外，对前列腺的 US 监测似乎有助于减少目标偏移。

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