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Influence of Polyvinylidene Chloride Sheets on Temperature Distribution in Hyperthermia Treatment 聚偏二氯乙烯片材对热疗中温度分布的影响
Pub Date : 2019-06-30 DOI: 10.3191/THERMALMED.35.2
Manabe Asami, T. Motomura, F. Inoue, H. Terashima
In hyperthermia treatment for superficial tumors, covering the affected part is often required to avoid intolerable pain. Polyvinylidene chloride (PVDC) sheets have been used to protect the affected area; however, the influence of PVDC covering on the temperature distribution is still unclear. In this study, the temperature changes caused by PVDC covering in hyperthermia treatment using agar phantoms were evaluated. In warming experiments, 30-cmand 10-cm-diameter electrodes were applied for deep and superficial warming, respectively. To confirm the effect of covering, either half the top side or both phantom ends were covered with the PVDC sheets or dry gauzes. After warming with various covering conditions, the temperature distribution of the phantoms was observed with thermography. The temperature changes over time were also evaluated with a thermocouple thermometer set in the border region of the covering. In deep warming, the increase of heat was slightly inhibited by PVDC covering, which intensified in the uncovered area. This contrast was amplified in superficial warming. Compared with PVDC, covering with dry gauzes showed a significant decrease and increase of heat in the covered and uncovered areas, respectively. In the observation of the temperature changes over time, during deep warming, the PVDC covering lowered no more than -0.4°C and the gauze covering lowered no more than -1.4°C, compared to that without any covers, in 10 min. In superficial warming, the heat increase in the gauze covering reached +7.0°C in only 5 min. This report showed that partial covering under electrodes could decrease the heat in the covered area and increase in the uncovered area. Although the temperature changes were minimal in PVDC covering, certain conditions could amplify the remodeling of the temperature distribution. Considering such changes is required to safely perform hyperthermia treatment.
在对浅表肿瘤的热疗治疗中,通常需要覆盖受影响的部分,以避免无法忍受的疼痛。聚氯乙烯(PVDC)薄板已被用于保护受影响的区域;然而,PVDC覆盖对温度分布的影响尚不清楚。在本研究中,使用琼脂模型评估PVDC覆盖在热疗治疗中引起的温度变化。在加温实验中,分别使用30命令直径为10 cm的电极进行深层和浅层加温。为了确认覆盖的效果,用PVDC片或干纱布覆盖一半的顶部或两个模端。在不同覆盖条件下加温后,用热像仪观察其温度分布。温度随时间的变化也被评估与热电偶温度计设置在覆盖的边界区域。在深度增温中,PVDC覆盖物略微抑制了热量的增加,在未覆盖区域热量增加加剧。这种对比在表面变暖中被放大了。与PVDC相比,干燥纱布覆盖的被覆盖区域和未覆盖区域的热量分别显著减少和增加。在温度随时间变化的观察中,深度升温时,与不加任何覆盖物相比,PVDC覆盖物在10分钟内降低不超过-0.4℃,纱布覆盖物在10分钟内降低不超过-1.4℃。在浅升温时,纱布覆盖物的热量增加仅在5分钟内达到+7.0℃。本报告显示,电极下部分覆盖物可以减少被覆盖区域的热量,增加未覆盖区域的热量。虽然PVDC覆盖层的温度变化很小,但某些条件会放大温度分布的重塑。考虑到这些变化需要安全地进行热疗治疗。
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引用次数: 0
Heating Characteristics of Developed Rectangular Resonant Cavity Applicator for Non-contact Hyperthermia Treatments 用于非接触式热疗的矩形谐振腔涂抹器的加热特性
Pub Date : 2019-03-15 DOI: 10.3191/THERMALMED.35.1
Y. Ichishima, Y. Shindo, Y. Iseki, Kazuo Kato
In our previous study, a non-invasive heating method was proposed which could utilize a re-entrant type resonant cavity applicator for deep-seated tumors. For the first time, a prototype heating system using a cylindrical resonant cavity applicator was developed, and results from the experimental heating of agar phantoms and animals were discussed. In the proposed method, as a whole human body was set in the cylindrical resonant cavity applicator to heat the targeted area, there was a risk of heating healthy human tissues. In the present paper, a new method using a rectangular resonant cavity is proposed to non-invasively heat the targeted area without physical contact to the subject. Dimensions of the rectangular resonant cavity applicator were 60 cm in height, 70 cm in width and 20 cm in length. In this method, since the targeted area is placed inside the rectangular resonant cavity applicator, the risk of heating the healthy tissue is minimized. Here, the measured temperature distributions of the heated agar phantom with the developed system was described. First, a setup of the proposed resonant cavity applicator was presented. Second, the results of heating human shaped agar phantom were presented. Finally, the results of computer simulations and experiments with the developed prototype heating system were discussed. From these results, it was found that the proposed rectangular resonant cavity applicator could be useful in controlling a small heated area without contact to the human body, and could be applicable for treating various tumors.
在我们之前的研究中,我们提出了一种非侵入性的加热方法,该方法可以利用再入式谐振腔涂抹器对深部肿瘤进行加热。本文首次研制了一种基于圆柱形谐振腔的加热系统,并对琼脂模型和动物的加热结果进行了讨论。在本文提出的方法中,由于将整个人体置于圆柱形谐振腔涂抹器中以加热目标区域,因此存在加热健康人体组织的风险。本文提出了一种利用矩形谐振腔对目标区域进行非侵入性加热的新方法,而无需与目标物体进行物理接触。矩形谐振腔加药器的尺寸为高60 cm,宽70 cm,长20 cm。在这种方法中,由于目标区域被放置在矩形谐振腔涂抹器内,因此将加热健康组织的风险降至最低。本文描述了用所开发的系统加热琼脂模体的温度分布。首先,给出了谐振腔加药器的结构。其次,给出了人形琼脂体的加热结果。最后,讨论了所研制的原型加热系统的计算机仿真和实验结果。结果表明,所设计的矩形谐振腔应用器可以在不接触人体的情况下控制小范围的受热区域,可用于治疗各种肿瘤。
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引用次数: 4
Heating Properties of RF Capacitive Applicator with Magnetic Nanoparticles 磁性纳米颗粒射频电容式涂敷器的加热性能
Pub Date : 2018-12-15 DOI: 10.3191/THERMALMED.34.53
Y. Iseki, Y. Shindo, K. Saito, Kazuo Kato
: This study describes the temperature properties of the radio frequency ( RF ) capacitive applicator with magnetic nanoparticles. In a clinic, two types of heating devices are most commonly used. One among these heating devices is a dielectric heating applicator, whereas the other type is an induction heating applicator. One of the disadvantages of dielectric heating applicators is their tendency to overheat the fat layers. Further, a cooling system is attached to reduce overheating. However, overheating remains one of most significant disadvantages of a dielectric applicator. In contrast, it is difficult to produce localized heating energy to the deep-seated tumors using induction heating applicators. To overcome these problems, we propose a method for using magnetic nanoparticles combined with an RF capacitive applicator. Further, the effectiveness of the proposed method has been examined by performing computer simulations and heating experiments using our prototype RF capacitive applicator. This study describes the temperature properties that are associated with the usage of magnetic nanoparticles and a hyperthermia applicator. First, the characteristics of a dielectric heating device and an induction heating device are described. Second, the electric properties of magnetic nanoparticles that exhibit concentrations ranging from 20 to 60 mg / cm 3 are measured in the frequency range from 100 MHz to 1.0 GHz, further, the temperature properties of the RF capacitive applicator with magnetic nanoparticles are calculated using the finite element method (FEM). Finally, the heating experiments are conducted using our prototype RF capacitive applicator and infrared thermal camera. These results of this study indicated that dielectric heating was the dominant heating mechanism in case of an RF capacitive applicator with magnetic nanoparticles. Additionally, it was suggested that the usage of magnetic nanoparticles will make it possible to control the heated area inside a patient ʼ s body. Thus, we observed that it was possible to use magnetic nanoparticles for performing effective hyperthermia treatment based on the results of both computer simulations and heating experiments.
本研究描述了带有磁性纳米颗粒的射频(RF)电容式涂敷器的温度特性。在诊所里,有两种最常用的加热装置。这些加热装置中的一种是电介质加热施加器,而另一种类型是感应加热施加器。电介质加热涂敷器的缺点之一是容易使脂肪层过热。此外,还附有冷却系统以减少过热。然而,过热仍然是电介质施加器最显著的缺点之一。相比之下,使用感应加热装置难以对深部肿瘤产生局部加热能量。为了克服这些问题,我们提出了一种将磁性纳米颗粒与射频电容应用器结合使用的方法。此外,通过使用我们的原型射频电容式应用器进行计算机模拟和加热实验,验证了所提出方法的有效性。本研究描述了与磁性纳米颗粒和热疗应用器的使用相关的温度特性。首先,介绍了介电加热装置和感应加热装置的特性。其次,在100 MHz ~ 1.0 GHz频率范围内测量了浓度为20 ~ 60 mg / cm3的磁性纳米颗粒的电性能,并利用有限元法计算了磁性纳米颗粒射频电容式涂敷器的温度特性。最后,利用原型射频电容式涂敷器和红外热像仪进行了加热实验。这些研究结果表明,在具有磁性纳米颗粒的射频电容式应用器中,介质加热是主要的加热机制。此外,有人认为磁性纳米颗粒的使用将使控制病人体内的加热区域成为可能。因此,我们观察到,基于计算机模拟和加热实验的结果,使用磁性纳米颗粒进行有效的热疗治疗是可能的。
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引用次数: 1
A Review of Regional Hyperthermia for Digestive Cancers: Current Status and Future Directions 消化道肿瘤局部热疗的研究进展:现状和未来方向
Pub Date : 2018-09-15 DOI: 10.3191/THERMALMED.34.35
T. Ishikawa, T. Okayama, Naoyuki Sakamoto, S. Kokura, T. Yoshikawa
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引用次数: 0
Formation Mechanism and Cellular Functions of Nuclear Stress Bodies Induced by Heat Stress 热胁迫诱导核应激体的形成机制及细胞功能
Pub Date : 2018-09-15 DOI: 10.3191/THERMALMED.34.23
Yuichi Miyoshi, Kazunori Watanabe
: Mammal possesses mechanisms that respond to environmental stresses, including heat, oxidation, radiation. Stress responses include cell death induction mechanism such as apoptosis and stress accommodation mechanism for survival. One of a major stress accommodation mechanism is formation of stress granules (SGs) and nuclear stress bodies (nSBs). SGs and nSBs, which are constituted by many proteins and RNAs, are reversible intracellular structures formed only when cells are exposed to environmental stresses. SGs, formed in the cytoplasm, have been found in a wide range of eukaryotes from yeast to humans. Intriguingly, nSBs, formed in the nucleus, have been found only in human cells. In this review, we focus on nSBs. nSBs were discovered in heat-stressed cells in 1989, and then many proteins and RNAs have been identified. Major components of nSBs are heat shock transcription factor family, splicing factors and noncoding RNAs (Satellite III RNA and initiator / elongator tRNA). Recently, many researchers have reported the formation mechanism of nSBs, however cellular functions of nSBs remain unclear. In this review, we introduce the basic researches focusing on the nSBs formation mechanism and cellular functions of nSBs constitution factors.
哺乳动物具有对环境压力作出反应的机制,包括热、氧化、辐射。应激反应包括细胞凋亡等诱导死亡机制和生存的应激调节机制。应力颗粒(SGs)和核应力体(nsb)的形成是应力调节的主要机制之一。SGs和nsb是由多种蛋白质和rna组成的可逆细胞内结构,只有在细胞受到环境胁迫时才会形成。在细胞质中形成的SGs,已经在从酵母到人类的许多真核生物中发现。有趣的是,在细胞核中形成的nsb只在人类细胞中被发现。在这篇综述中,我们主要关注nsb。nsb于1989年在热应激细胞中被发现,随后被鉴定出许多蛋白质和rna。nsb的主要成分是热休克转录因子家族、剪接因子和非编码RNA (Satellite III RNA和启动子/延长子tRNA)。近年来,许多研究者报道了非nsb的形成机制,但其细胞功能尚不清楚。本文主要介绍了非甾体抗体形成机制和非甾体抗体构成因子的细胞功能等方面的研究进展。
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引用次数: 1
Heat Induces Histone γH2AX Formation under Hypoxia 热诱导缺氧条件下组蛋白γ - h2ax的形成
Pub Date : 2018-09-15 DOI: 10.3191/THERMALMED.34.45
Y. Yoshida, S. Tominaga, Liqiu Ma, A. Takahashi
: Tumor hypoxia is a negative prognostic and predictive factor for radiotherapy, and hyperthermia therapy is clinically useful for overcoming radioresistance in hypoxic tumors. However, the mechanism for the hyperthermia-induced cell death observed in hypoxic tumors remains unknown. We aimed to clarify the relationship between heat sensitivity and heat-induced DNA double-strand breaks (DSBs), reflecting DNA damage, in tumor cells under hypoxia. HeLa human cervical epithelial adenocarcinoma cells were subjected to heat treatment or X-ray irradiation under hypoxia or normoxia. Control cells were left untreated. The formation of DSBs was evaluated by immunocytochemistry for histone γ H2AX foci, given that one histone γ H2AX focus reflects one DSB. Cell survival was evaluated by colony-formation assays. The colony-formation assays revealed that hypoxic cells showed greater radioresistance, as expected, but only slightly higher heat resistance than normoxic cells. Under normoxia, heat-treated or X-ray-irradiated cells showed larger amounts of γ H2AX foci formation than control cells, reflecting increased DSB formation and more DNA damage. Under hypoxia, heat-treated cells showed a less remarkable decrease in γ H2AX foci formation than X-ray-irradiated cells, reflecting sustained levels of DSB formation and DNA damage. The present findings indicate that heat treatment can induce DNA damage via DSB formation reflected by γ H2AX foci formation under hypoxia. The findings provide further support for an important role of heat-induced DSB damage in cell killing in hypoxic tumors that show radioresistance. Hyperthermia therapy can be beneficial for the prognosis of cancer patients through increased DNA damage leading to tumor cell death.
肿瘤缺氧是放疗的不良预后和预测因素,热疗治疗在临床上有助于克服缺氧肿瘤的放射抵抗。然而,在低氧肿瘤中观察到的高温诱导细胞死亡的机制尚不清楚。我们旨在阐明在缺氧条件下肿瘤细胞的热敏性与热诱导DNA双链断裂(DSBs)之间的关系,DSBs反映了DNA损伤。将HeLa人宫颈上皮腺癌细胞在缺氧或常氧条件下进行热处理或x射线照射。对照细胞未经处理。考虑到一个组蛋白γ H2AX灶反映一个DSB,通过免疫细胞化学评估DSB的形成。通过集落形成试验评估细胞存活率。集落形成实验显示,缺氧细胞表现出更强的抗辐射能力,正如预期的那样,但耐热性仅略高于常氧细胞。在常氧条件下,热处理或x射线照射的细胞比对照细胞显示出更多的γ H2AX病灶形成,反映出DSB形成增加和更多的DNA损伤。在缺氧条件下,与x射线照射的细胞相比,热处理细胞的γ H2AX灶形成的减少幅度较小,这反映了DSB形成和DNA损伤的持续水平。研究结果表明,在缺氧条件下,热处理可以通过DSB的形成诱导DNA损伤,DSB的形成反映为γ H2AX病灶的形成。该研究结果进一步支持热诱导DSB损伤在显示放射抗性的缺氧肿瘤细胞杀伤中的重要作用。热疗可以通过增加DNA损伤导致肿瘤细胞死亡来改善癌症患者的预后。
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引用次数: 0
Heat Meets DNA: DNA Damage and Repair 热与DNA相遇:DNA损伤与修复
Pub Date : 2018-06-15 DOI: 10.3191/THERMALMED.34.15
Y. Nakagawa, A. Kajihara, T. Kirita, Eiichiro Mori
Hyperthermia is generally used in combination with chemo and radiation therapy in the treatment of various cancers. Thus far, most studies have focused on the additive effects of heat shock. However, it is also critical to understand the solitary effect of heat shock stress on mammalian cells. DNA double-strand breaks (DSBs) are known to be generated by ionizing radiation and a variety of DNA modifying reagents. As shown by neutral comet assays and γH2AX (phosphorylated histone H2AX at serine 139) focus formation, heat shock also induces DSBs. While existing literature suggests that heat shock leads to cell death through the induction of DSBs, the pathway involved in repairing heat-induced damage remains to be elucidated. In the current review, we examined the history of hyperthermia, from the discovery of DSBs after heat shock, to our recent finding regarding the homologous recombination repair pathway after heat shock.
热疗通常与化疗和放疗联合使用,用于治疗各种癌症。迄今为止,大多数研究都集中在热休克的加性效应上。然而,了解热休克应激对哺乳动物细胞的孤立效应也是至关重要的。DNA双链断裂(DSBs)是由电离辐射和各种DNA修饰试剂产生的。中性彗星实验和γ - H2AX(丝氨酸第139位磷酸化组蛋白H2AX)焦点的形成表明,热休克也会诱导dsb。虽然现有文献表明热休克通过诱导dsb导致细胞死亡,但修复热损伤的途径仍有待阐明。在当前的综述中,我们研究了热疗的历史,从热休克后dsb的发现,到我们最近关于热休克后同源重组修复途径的发现。
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引用次数: 3
Basic Study of 3-D Non-Invasive Measurement of Temperature Distribution Using Ultrasound Images during FUS Heating 超声图像三维无创测量FUS加热过程温度分布的基础研究
Pub Date : 2018-03-15 DOI: 10.3191/THERMALMED.34.1
Eitaro Miura, Kazuo Kato, A. Takeuchi
A R T I C L E I N F O A B S T R A C T Article history: Received: 16 September, 2020 Accepted: 01 December, 2020 Online: 16 December, 2020 High Intensity Focused Ultrasound (HIFU) was widely used for treating tumors noninvasively. In this treatment, ultrasound is focused on the target volume inside the human body to ablate cancerous tissues and Magnetic Resonance Imaging (MRI) is mainly used to grasp the target position and to measure the temperature distributions around the target. However, MRI is very expensive, and a large space is required. In this paper, we presented a method for measuring the temperature distribution using an ultrasound diagnostic device, which is inexpensive and commonly used in many clinics, and actually showed the results of heating experiments on a human shaped agar phantom. The proposed method for measuring the temperature distribution around the heated target was conducted by performing image processing on two ultrasound images before and after heating. Furthermore, it was confirmed that it was possible to grasp the three-dimensional temperature distribution from the images in multiple layers. The effectiveness of the temperature distribution measurement results by the proposed method was shown by comparing the temperature measurement results with the infrared thermal camera. The error between the results was approximately 1 °C. It was found that the non-invasive measurement method of the three-dimensional temperature distribution around the target volume using the ultrasound images was useful for effective HIFU treatments.
A R T I C L E I N F O A B S T R A C T文章历史:收稿日期:2020年9月16日接收日期:2020年12月01日发布日期:2020年12月16日高强度聚焦超声(High Intensity Focused Ultrasound, HIFU)被广泛应用于肿瘤的无创治疗。在这种治疗中,超声聚焦于人体内部的靶体积,以消融癌组织,磁共振成像(MRI)主要用于掌握靶的位置和测量靶周围的温度分布。然而,MRI非常昂贵,并且需要很大的空间。在本文中,我们提出了一种使用超声诊断设备测量温度分布的方法,这种设备价格低廉,在许多诊所中都很常用,并实际展示了在人形琼脂体上加热实验的结果。所提出的测量被加热目标周围温度分布的方法是通过对加热前后的两张超声图像进行图像处理来实现的。进一步证实了从多层图像中掌握三维温度分布是可能的。通过与红外热像仪测温结果的比较,验证了该方法测温结果的有效性。结果之间的误差约为1°C。发现利用超声图像无创测量靶体周围三维温度分布的方法有助于有效的HIFU治疗。
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引用次数: 4
Improved Deep Thermal Rehabilitation System with Temperature Measurement Function Using Ultrasound Images 具有超声图像测温功能的改进型深度热康复系统
Pub Date : 2017-01-01 DOI: 10.3191/THERMALMED.33.91
Y. Shindo, Kenji Takahashi, F. Ikuta, Y. Iseki, Kazuo Kato
This paper describes an improved deep thermal osteoarthritis (OA) rehabilitation system which has a temperature distribution measurement system. In a previous study, we developed a resonant cavity applicator for treating OA and proved that this system was able to heat the knee joint more effectively than other methods; however, this heating system did not have a temperature measurement function. Meanwhile, in a different study, we developed a method using ultrasound imaging techniques to calculate temperature distributions inside the human body. In consideration of clinical application of this applicator, it is necessary to be able to measure the temperature of human tissue during heating. With our applicator, the most important thing is to create an electromagnetic resonant mode deep inside the cavity. Unfortunately, because of electromagnetic interference, we could not utilize an ultrasound imaging probe inside the cavity during heating. To overcome this critical problem, we developed a heating system with a new temperature measurement system. We designed an original jig made of PTFE and developed the remote controllable robotic arm to properly position the probe to take ultrasound images as precisely as possible. Furthermore, the resonant cavity applicator was modified so that it was able to house the ultrasound imaging probe during the heating treatment. In this paper, we first evaluate the performance of the jig by comparing displacement vector distributions. Second, we discuss the results of a heating experiment using this prototype applicator. From our results, it was found that our thermal rehabilitation system with the added temperature measurement function would be useful in clinics for treating osteoarthritis inside the knee joint.
本文介绍了一种改进型深热性骨关节炎(OA)康复系统,该系统具有温度分布测量系统。在之前的研究中,我们开发了一种用于治疗OA的谐振腔应用器,并证明该系统能够比其他方法更有效地加热膝关节;然而,这个加热系统没有温度测量功能。与此同时,在另一项研究中,我们开发了一种使用超声成像技术计算人体内温度分布的方法。考虑到该涂抹器的临床应用,需要能够在加热过程中测量人体组织的温度。使用我们的涂敷器,最重要的是在腔内深处创建一个电磁谐振模式。不幸的是,由于电磁干扰,我们无法在加热时在腔内使用超声成像探头。为了克服这一关键问题,我们开发了一种带有新型温度测量系统的加热系统。设计了一种由聚四氟乙烯制成的原始夹具,并开发了遥控机械臂,以正确定位探头,尽可能精确地拍摄超声图像。此外,对谐振腔涂抹器进行了改进,使其能够在加热过程中容纳超声成像探头。在本文中,我们首先通过比较位移矢量分布来评估跳汰机的性能。其次,我们讨论了使用该原型涂敷器进行加热实验的结果。结果表明,我们的热康复系统具有额外的温度测量功能,可用于临床治疗膝关节内骨关节炎。
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引用次数: 5
Magnetic Particle Imaging for Quantitative Evaluation of Tumor Response to Magnetic Hyperthermia Treatment Combined with Chemotherapy Using Cisplatin 磁颗粒成像定量评价肿瘤对磁热疗联合顺铂化疗的反应
Pub Date : 2017-01-01 DOI: 10.3191/THERMALMED.33.39
Akiko Ohki, Minori Tanoue, Sayumi Kobayashi, K. Murase
This study was undertaken to evaluate the tumor response to magnetic hyperthermia treatment (MHT) combined with cisplatin (MHT+CDDP) using magnetic particle imaging (MPI). Colon-26 cells were implanted into the backs of mice. When the tumor volume exceeded approximately 100 mm3, the mice were divided into control, MHT, CDDP, and MHT+CDDP groups. In the CDDP and MHT+CDDP groups, CDDP (5 mg/kg) was injected intraperitoneally. In the MHT+CDDP group, magnetic nanoparticles [250 mM (14.0 mg Fe/mL) Resovist®]were directly injected into the tumor one hour after CDDP administration, and MHT was performed for 20 min using an alternating magnetic field. In the MHT group, only MHT was performed after the injection of Resovist®. In the MHT+CDDP and MHT groups, MPI images were obtained using our MPI scanner immediately before, immediately after, and 3, 7, and 14 days after MHT. After the MPI studies, we drew a region of interest (ROI) on the tumor in the MPI image and calculated the average and maximum MPI values and the number of pixels within the ROI. In all groups, the relative tumor volume growth (RTVG) was calculated from (V-V0)/V0, where V0 and V were the tumor volumes immediately before and after treatment, respectively. The RTVG value in the MHT+CDDP group was significantly lower than that in the MHT group 3 to 14 days after MHT. It was also significantly lower than that in the CDDP group at 4 to 11 days except at 6 and 9 days after treatment. The average and maximum MPI values normalized by those immediately before MHT in the MHT+CDDP group were significantly higher than those in the MHT group 3 days after MHT. Our results suggested that MPI is useful for quantitatively evaluating tumor response to MHT combined with chemotherapy.
本研究采用磁颗粒成像(MPI)技术评估磁热疗(MHT)联合顺铂(MHT+CDDP)治疗后肿瘤的反应。结肠癌-26细胞被植入小鼠背部。当肿瘤体积超过约100 mm3时,将小鼠分为对照组、MHT组、CDDP组和MHT+CDDP组。CDDP组和MHT+CDDP组腹腔注射CDDP (5 mg/kg)。在MHT+CDDP组,CDDP给药1小时后,将磁性纳米颗粒[250 mM (14.0 mg Fe/mL) Resovist®]直接注射到肿瘤中,并在交变磁场下进行MHT 20分钟。MHT组仅在注射Resovist®后进行MHT。在MHT+CDDP组和MHT组中,使用我们的MPI扫描仪在MHT前、后、后3、7和14天获得MPI图像。在MPI研究结束后,我们在MPI图像的肿瘤上绘制了一个感兴趣区域(ROI),并计算了平均和最大MPI值以及ROI内的像素数。各组相对肿瘤体积生长量(RTVG)由(V-V0)/V0计算,其中V0和V分别为治疗前和治疗后的肿瘤体积。MHT+CDDP组的RTVG值在MHT后3 ~ 14天显著低于MHT组。除治疗后6、9天外,治疗后4 ~ 11天均显著低于CDDP组。MHT+CDDP组在MHT后3 d的MPI均值和最大值均显著高于MHT组。我们的研究结果表明,MPI可用于定量评估肿瘤对MHT联合化疗的反应。
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引用次数: 5
期刊
Thermal Medicine
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