调强放疗同期时辰化疗治疗局部晚期鼻咽癌临床研究

目的 观察调强放疗同期时辰化疗治疗局部晚期鼻咽癌的近期疗效和不良反应.方法 60例初治局部晚期鼻咽癌患者随机分为时辰化疗组和常规化疗组,每组各30例,2组化疗和放疗同时进行.化疗方案:顺铂800 mg·m-2,放疗第1天开始,分3d给药,每21 d为1周期,连用2周期.时辰化疗组将顺铂于每天的10:00至22:00持续泵入,并于每天15:30至16:30将泵入速度增加3倍.常规化疗组于每天10:00开始常规滴注.放、化疗结束后观察2组治疗效果及不良反应.结果 时辰化疗组和常规化疗组的有效率分别为40.0％和23.3％,差异无统计学意义(P＞0.05).时辰化疗组患者白细胞减少、恶心呕吐、口腔黏膜炎发生率均明显低于常规化疗组,差异有统计学意义(P均＜0.05).结论 调强放疗同期时辰化疗治疗局部晚期鼻咽癌安全有效.     

调强放射治疗联合铂类化疗治疗局部晚期鼻咽癌预后分析

[目的]评价调强放射治疗联合铂类化疗治疗不同亚组局部晚期鼻咽癌的预后.[方法]将181例连续收治经病理学确诊的初治局部晚期鼻咽癌分为3组,以局部扩展为主要特征的T3～4N0～1M066例,以区域淋巴结转移为主要特征的T1～2N2～3M0 42例及混合型T3～4N2～3M0 73例,均采用调强放射治疗合并以铂类为基础的诱导化疗及同步化疗.中位随访24个月.[结果]局部扩展型、区域淋巴结转移型和混合型2年局部区域控制率分别为92.3％、100％及97.2％ (P=0.32);2年无远处转移生存率分别为91.1％,78.2％和76.3％ (P=0.016);2年无进展生存率分别为86.7％,78.2％和77.0％(P=0.095).COX多因素分析示N分期是局部晚期鼻咽癌远处转移及疾病相关死亡的独立的危险因素(HR=2.99,95 ％CI:1.65～5.44;HR=3.20,95％CI:1.58～6.49).[结论]在调强放疗联合铂类化疗的治疗背景下,局部及区域晚期鼻咽癌中N2～3亚组预相对较差,远处转移率及疾病相关死亡率上升.     

鼻咽癌调强放疗118例临床观察

目的：观察鼻咽癌调强放疗（ IMRT）的疗效和不良反应。方法鼻咽癌初治患者118例,按2008分期标准,Ⅰ期5例,Ⅱ期29例,Ⅲ期45例,Ⅳ期39例;均予调强放疗,总剂量71．9～74．3Gy,每次2．28～2．34 Gy。结果中位随访时间42个月,1、2、3年总生存率分别为97．5％、93．2％和88．1％。急性不良反应主要是放射性黏膜炎,Ⅰ～Ⅳ级分别为22．9％、41．5％、30．5％、1．7％。晚期不良反应主要是口干,Ⅰ级31．4％,Ⅱ级7．6％,Ⅲ级3．4％。结论鼻咽癌调强放疗虽然肿瘤靶区剂量高,但周围正常组织受量小,故不良反应较轻。     

调强放疗模式下局部晚期鼻咽癌诱导化疗后同期化疗与单纯放疗疗效比较

目的:探讨调强放疗模式下局部晚期鼻咽癌诱导化疗后同期化疗与单纯放疗临床疗效的比较。方法:回顾性分析2010年-2012年期间在本院采用调强放疗技术治疗的局部晚期鼻咽癌,分期为Ⅲ-Ⅳ期的鼻咽癌患者共120例。所有患者都进行过诱导化疗。放疗范围及剂量为鼻咽原发灶、阳性淋巴结的大体肿瘤体积处方剂量为T1、T2期69.96Gy,T3、T4期72~74Gy;亚临床高危区靶体积处方剂量为60~64Gy;淋巴结阴性引流区处方剂量为50~54Gy。分为单纯放疗组60例,同期化疗组60例。同期化疗方案为单药顺铂为基础的方案。主要观察两组的近期疗效、3年无瘤生存率(DFS)、3年无局部区域复发生存率（LRFS）、3年无远处转移生存率（MFS）、3年总生存率（OS）及治疗的毒副反应情况。结果:两组性别、年龄、病理类型及临床分期的构成比均有可比性。两组患者中位随访36个月。治疗结束3个月两组患者的完全缓解率分别为83.3％、80.0％,3年无瘤生存率分别为78.3％、75.0％,3年的无局部区域复发生存率分别为93.3％、90.0％,3年无远处转移生存分别为81.7％、83.3％,3年总生存率分别为88.3％、86.7％,两组统计学无明显差异。同期化疗组急性毒副反应高于单纯放疗组。结论:在调强放疗治疗模式下,局部晚期鼻咽癌同期化疗与单纯放疗相比,患者的3年总生存率及无瘤生存率未能进一步提高,而急性毒副反应增加,同期化疗在调强放疗模式下治疗策略需要行进一步的临床研究。     

调强放疗联合不同周期新辅助化疗治疗局部晚期鼻咽癌的近远期疗效

目的 探讨调强放疗联合不同周期新辅助化疗治疗局部晚期鼻咽癌的近远期疗效。方法 依据新辅助化疗周期的不同将104例局部晚期鼻咽癌患者分为对照组（n=51）和观察组（n=53）,两组患者均给予调强放疗联合新辅助化疗治疗,对照组患者给予1～2个周期的新辅助化疗,观察组患者给予≥3个周期的新辅助化疗。比较两组患者的临床疗效、不良反应及随访5年的预后情况。结果 观察组患者的治疗总有效率为73.58%,与对照组患者的60.78%比较,差异无统计学意义（P﹥0.05）。两组患者白细胞减少、恶心呕吐、血小板减少、肝肾功能异常、贫血发生率比较,差异均无统计学意义（P﹥0.05）。观察组患者的5年总生存率高于对照组,远处转移率低于对照组,差异均有统计学意义（P﹤0.05）;但两组患者局部复发率比较,差异无统计学意义（P﹥0.05）。结论调强放疗联合≥3个周期的新辅助化疗可提高局部晚期鼻咽癌患者的总生存率,降低远处转移率。     

化疗联合调强放疗治疗老年（≥65岁）局部晚期鼻咽癌的疗效及安全性

目的:探讨化疗联合调强放疗治疗老年（≥65岁）局部晚期鼻咽癌的疗效及安全性。方法:回顾性分析2012年01月至2017年02月我院肿瘤放射治疗科收治的老年局部晚期鼻咽癌患者的临床资料,将初次经调强放疗（intensity modulated radiation therapy,IMRT）的45例患者作为IMRT组。用成组匹配的方法（匹配条件:年龄、性别、病理类型、TNM分期、T分期、N分期、合并症）选取同期经IMRT/化疗（chemotherapy,CT)治疗的老年局部晚期鼻咽癌患者45例,作为IMRT/CT组。比较两组的近期疗效及毒副反应发生率。结果:IMRT/CT组和IMRT组鼻咽部完全缓解率分别为88.9%和82.2%,淋巴结区完全缓解率为76.5%和73.0%。IMRT/CT组和IMRT组1年、3年OS分别为91.1%和88.9%、71.1%和68.9%,1年、3年PFS分别为82.2%和77.8%、64.4%和57.8%。IMRT/CT组出现3-4级白细胞减少、呕吐、黏膜炎人数明显高于IMRT组患者,差异有统计学意义（P＜0.05）。结论:化疗联合IMRT并不能明显改善老年（≥65岁）局部晚期鼻咽癌患者的生存预后,且增加了治疗相关的3-4级毒副反应发生率,单独的IMRT可能是老年局部晚期鼻咽癌患者的一种低毒性的有效治疗方法。     

调强放疗与三维适形放疗治疗局部晚期鼻咽癌的疗效及毒副作用对比

目的 探讨调强放疗(IMRT)与三维适形放疗(3D-CRT)治疗局部晚期鼻咽癌的毒副作用及治疗效果.方法 将120例局部晚期鼻咽癌患者随机分为观察组与对照组,每组60例.观察组采用调强适形放疗,对照组采用三维适形放疗.结果 2组随访时间、生存率及复发率差异无统计学意义(P>0.05).随着时间延长,对照组中耳炎发生率增高速度明显高于观察组(P<0.05);观察组口腔毒副作用占46.67%,消化系统毒副作用占36.67%,血液系统毒副作用占10.00%,皮肤毒副作用占70.00%.对照组口腔毒副作用占56.67%,消化系统毒副作用占46.67%,血液系统毒副作用占16.67%,皮肤毒副作用占90.00%.由于样本量限制,2组未见统计学差异(P>0.05).结论 IMRT与3D-CRT相比,效果相当,但毒副作用相对较小,需要进一步大样本验证.     

鼻咽癌局部复发调强放疗的初步疗效观察

目的：评价调强放疗（IMRT）在复发性鼻咽癌中应用的剂量分布、近期疗效及毒性反应。方法：2005年1月～2006年7月，12例经鼻咽部活检病理证实的复发性鼻咽癌患者采用全程IMRT，计划靶区（P1V）处方剂量为60Gy～76．44Gy（中位剂量69．72Gy），分次量1．87Gy～2．32Gy。结果：PTV的中位体积为145．55cm^3，D95均值为59．5Gy，PTV接受的平均剂量及分次剂量均值分别为68．35Gy及2．13Gy；治疗结束时近期疗效为CR6例，PR4例，总有效率为83．3％。经3～17个月（中位10．5个月）随访，全部病例存活，1例出现鼻咽部再次复发，1例出现左颈部淋巴结复发，1例出现双颈、锁骨上淋巴结复发以及纵隔淋巴结、肝脏转移。治疗过程中除部分患者出现体重下降，轻度的口腔粘膜反应、粒细胞减少等，所有患者均能耐受治疗。结论：调强放疗在鼻咽癌放疗后局部复发患者中应用有较好的局控效果，能被患者耐受。     

鼻咽癌局部复发调强放疗的初步疗效观察

目的:评价调强放疗(IMRT)在复发性鼻咽癌中应用的剂量分布、近期疗效及毒性反应。方法:2005年1月～2006年7月,12例经鼻咽部活检病理证实的复发性鼻咽癌患者采用全程IMRT,计划靶区(PTV)处方剂量为60Gy～76.44Gy(中位剂量69.72Gy),分次量1.87Gy～2.32Gy。结果:PTV的中位体积为145.55cm3,D95均值为59.5Gy,PTV接受的平均剂量及分次剂量均值分别为68.35Gy及2.13Gy;治疗结束时近期疗效为CR6例,PR4例,总有效率为83.3%。经3～17个月(中位10.5个月)随访,全部病例存活,1例出现鼻咽部再次复发,1例出现左颈部淋巴结复发,1例出现双颈、锁骨上淋巴结复发以及纵隔淋巴结、肝脏转移。治疗过程中除部分患者出现体重下降,轻度的口腔粘膜反应、粒细胞减少等,所有患者均能耐受治疗。结论:调强放疗在鼻咽癌放疗后局部复发患者中应用有较好的局控效果,能被患者耐受。     

鼻咽癌调强放疗的临床疗效观察

目的：探讨调强放疗治疗鼻咽癌的疗效和毒副反应。方法383例鼻咽癌患者分为调强放疗组（131例）和常规放疗组（252例）,分别接受调强放疗和常规放疗。结果调强放疗组1、3、5 a局部控制率分别为100.0％、93.1％、91.6％,1、3、5 a生存率分别为98.5％、87.8％、74.8％;常规放疗组分别为97.6％、82.9％、78.2％和95.2％、71.4％、61.5％,其中调强放疗组3、5 a局部控制率及生存率均明显高于常规放疗组（P＜0.05）。调强放疗组口干、张口受限、听力下降、颈部组织纤维化和放射性脑病发生率均低于常规放疗组（ P＜0.05）。结论调强放疗技术能最大限度提高鼻咽癌的肿瘤控制率和降低周围正常组织的照射剂量,从而改善鼻咽癌患者的生存状况,值得推广应用。     

Treatment outcomes after reduction of the target volume of intensity-modulated radiotherapy following induction chemotherapy in patients with locoregionally advanced nasopharyngeal carcinoma: A prospective,multi-center,randomized clinical trial

Purpose

To investigate whether reducing the target volume of intensity-modulated radiotherapy (IMRT) after induction chemotherapy (IC) improves the quality of life (QOL) in locoregionally advanced nasopharyngeal carcinoma (NPC) without decreasing the local control and survival rate.

Update report of nasopharyngeal carcinoma treated with reduced-volume intensity-modulated radiation therapy and hypothesis of the optimal margin

Background and purpose

To establish the minimally required margins in different directions measured from GTV in the definitive treatment of nasopharyngeal carcinoma (NPC) using IMRT based on the 5-year results.

Methods and materials

Between November 2003 and May 2007, 414 patients with non-metastatic NPC were treated with IMRT according to our institutional protocol. Treatment outcomes at 5 years were analyzed. Distances from GTV-T to CTV2 (i.e., CTV 59.4 Gy) in 6 directions (anterior, posterior, superior, inferior, and bilateral) were measured and analyzed.

Results

The 5-year estimated overall survival (OS), disease free survival (DFS), local control (LC) were 80%, 77% and 95%, respectively. For the margins measured from GTV-T to CTV2, margins used with T4 disease were significantly and uniformly smaller than the whole group in all the 6 directions (P = 0.000, 0.000, 0.000, 0.000 and 0.046, respectively). However, no increase of local recurrence was associated to this limited margins used.

Conclusions

Our 5-years’ experience showed a very high LC rate. The strategy we used for CTV delineation was safe and reliable. Determined CTV through GTV expansion to a minimally required margin, using GTV + margin (used in our T4 patients) + the whole nasopharyngeal mucosa, especially for the patients with early T disease, might be feasible.     

A dosimetric analysis of dose escalation using two intensity-modulated radiation therapy techniques in locally advanced pancreatic carcinoma

PURPOSE: To perform an analysis of three-dimensional conformal radiation therapy (3D-CRT), sequential boost intensity-modulated radiation therapy (IMRTs), and integrated boost IMRT (IMRTi) for dose escalation in unresectable pancreatic carcinoma. METHODS AND MATERIALS: Computed tomography images from 15 patients were used. Treatment plans were generated using 3D-CRT, IMRTs, and IMRTi for dose levels of 54, 59.4, and 64.8 Gy. Plans were analyzed for target coverage, doses to liver, kidneys, small bowel, and spinal cord. RESULTS: Three-dimensional-CRT exceeded tolerance to small bowel in 1 of 15 (6.67%) patients at 54 Gy, and 4 of 15 (26.7%) patients at 59.4 and 64.8 Gy. 3D-CRT exceeded spinal cord tolerance in 1 of 15 patients (6.67%) at 59.4 Gy and liver constraints in 1 of 15 patients (6.67%) at 64.8 Gy; no IMRT plans exceeded tissue tolerance. Both IMRT techniques reduced the percentage of total kidney volume receiving 20 Gy (V20), the percentage of small bowel receiving 45 Gy (V45), and the percentage of liver receiving 35 Gy (V35). IMRTi appeared superior to IMRTs in reducing the total kidney V20 (p < 0.0001), right kidney V20 (p < 0.0001), and small bowel V45 (p = 0.02). CONCLUSIONS: Sequential boost IMRT and IMRTi improved the ability to achieve normal tissue dose goals compared with 3D-CRT. IMRTi allowed dose escalation to 64.8 Gy with acceptable normal tissue doses and superior dosimetry compared with 3D-CRT and IMRTs.     

A treatment planning analysis of inverse-planned and forward-planned intensity-modulated radiation therapy in nasopharyngeal carcinoma

PURPOSE: To compare dose-volume histograms of target volumes and organs at risk in 57 patients with nasopharyngeal carcinoma (NPC) with inverse- (IP) or forward-planned (FP) intensity-modulated radiation treatment (IMRT). METHODS AND MATERIALS: The DVHs of 57 patients with NPC with IMRT with or without chemotherapy were reviewed. Thirty-one patients underwent IP IMRT, and 26 patients underwent FP IMRT. Treatment goals were to prescribe a minimum dose of 66-70 Gy for gross tumor volume and 59.4 Gy for planning target volume to greater than 95% of the volume. Multiple selected end points were used to compare dose-volume histograms of the targets, including minimum, mean, and maximum doses; percentage of target volume receiving less than 90% (1-V90%), less than 95% (1-V95%), and greater than 105% (1-V105%). Dose-volume histograms of organs at risk were evaluated with characteristic end points. RESULTS: Both planning methods provided excellent target coverage with no statistically significant differences found, although a trend was suggested in favor of improved target coverage with IP IMRT in patients with T3/T4 NPC (p = 0.10). Overall, IP IMRT statistically decreased the dose to the parotid gland, temporomandibular joint, brain stem, and spinal cord overall, whereas IP led to a dose decrease to the middle/inner ear in only the T1/T2 subgroup. CONCLUSIONS: Use of IP and FP IMRT can lead to good target coverage while maintaining critical structures within tolerance. The IP IMRT selectively spared these critical organs to a greater degree and should be considered the standard of treatment in patients with NPC, particularly those with T3/T4. The FP IMRT is an effective second option in centers with limited IP IMRT capacity. As a modification of conformal techniques, the human/departmental resources to incorporate FP-IMRT should be nominal.     

鼻咽癌调强放疗同步节拍化疗的临床研究

目的观察鼻咽癌调强放疗(intensity modulated radiation therapy,IMRT)同步口服卡培他滨节拍化疗的疗效及毒副反应。方法 118例鼻咽癌患者,随机分为实验组和对照组,对照组给予6MXV-X线根治性调强适形放疗,实验组在进行调强放射治疗的同时,节拍性口服卡培他滨每次500mg,每日2次,疗程12个月或至疾病进展为止。观察临床疗效和毒副反应。结果共有111例患者完成实验,近期疗效:实验组有效率(RR)100%,对照组有效率98.3%,两组间差异无统计学意义(P0.05)。远期疗效:实验组1、3、5年生存率分别为96.5%、92.3%和78.3%,中位总生存时间(OS)为58.838个月,中位无进展生存时间(PFS)为40.719个月;对照组1、3、5年生存率分别为89.7%、77.8%和50.0%,中位OS为50.126个月,中位PFS为24.962个月。两组间总生存时间和无进展生存时间均有统计学差异(OS:χ2=5.587,P=0.018;PFS:χ2=3.868,P=0.049)。两组治疗结束后均出现VEGF、PDGF-BB水平下降,TSP-1水平升高,且实验组变化的幅度较对照组更为显著,两组间各指标变化水平均有统计学差异(P0.05)。两组不良反应主要表现为白细胞减少、皮肤反应及口腔、口咽部黏膜反应,两组间不良反应无统计学差异(P0.05)。结论鼻咽癌调强放疗同步口服卡培他滨节拍化疗能提高患者的远期生存率,增强抗肿瘤新生血管形成能力,而并未增加毒副反应发生率及严重程度。     

调强适形放射治疗晚期前列腺癌的临床观察

目的：观察调强适形放射治疗（ＩＭＲＴ）对晚期前列腺癌患者的近期疗效及毒副作用。方法：对１５例病理明确的Ｔ４期患者行ＩＭＲＴ,２.２Ｇｙ／次,每日１次,每周照射５天,ＤＴ：８０Ｇｙ／３６ｆ,５３天完成。观察近期疗效包括排尿改善、ＰＳＡ变化、肿块缩小以及毒副作用。近期疗效采用ＷＨＯ实体瘤标准评价,毒副作用采用ＲＴＯＧ急性及晚期放射损伤分级标准。结果：１１例有排尿困难的患者放疗结束时症状基本缓解;除２例ＰＳＡ＞１００ｎｇ／ｍｌ外,９例放疗后６个月ＰＳＡ值明显下降。放疗后１、３、６个月复查有效率（按前列腺局部计算）分别为６６.７％（１０／１５）、６６.７％（１０／１５）和８０.０％（１２／１５）。急性胃肠道放射反应为２６.７％（４／１５）,２级６.７％（１／１５）,未出现３级,未发现有晚期胃肠道放射反应。急性泌尿系统放射反应为４０.０％（６／１５）,２级１３.３％（２／１５）;晚期泌尿系统放射反应为２０.０％（３／１５）,２级１３.３％（２／１５,前列腺电气化治疗患者）,未出现３级毒副反应。结论：ＩＭＲＴ治疗晚期前列腺癌近期疗效满意,毒副作用较轻,患者生活质量提高。     

Current status of intensity-modulated radiation therapy (IMRT)

External-beam radiation therapy has been one of the treatment options for prostate cancer. The dose response has been observed for a dose range of 64.8–81 Gy. The problem of external-beam RT for prostate cancer is that as the dose increases, adverse effects also increase. Three-dimensional conformal radiation therapy (3D-CRT) has enabled us to treat patients with up to 72–76 Gy to the prostate, with a relatively acceptable risk of late rectal bleeding. Recently, intensity-modulated radiation therapy (IMRT) has been shown to deliver a higher dose to the target with acceptable low rates of rectal and bladder complications. The most important things to keep in mind when using an IMRT technique are that there is a significant trade-off between coverage of the target, avoidance of adjacent critical structures, and the inhomogeneity of the dose within the target. Lastly, even with IMRT, it should be kept in mind that a “perfect” plan that creates completely homogeneous coverage of the target volume and zero or small dose to the adjacent organs at risk is not always obtained. Participating in many treatment planning sessions and arranging the beams and beam weights create the best approach to the best IMRT plan.     

TPF诱导化疗或PF诱导化疗联合同期放化疗治疗局部晚期鼻咽癌的临床观察

背景与目的：TPF(多西他赛+顺铂+氟尿嘧啶)诱导化疗加同期放化疗治疗局部晚期鼻咽癌的疗效尚不清楚。该研究旨在比较TPF诱导化疗或PF(顺铂+氟尿嘧啶)诱导化疗联合同期放化疗治疗局部晚期鼻咽癌的疗效和耐受性。方法：将局部晚期鼻咽癌患者随机分为两组。TPF组116例接受TPF诱导化疗(多西他赛60 mg/m2,第1天+顺铂60 mg/m2,第1天+氟尿嘧啶750 mg/m2,持续静脉滴注120 h),每3周重复,共3个疗程。PF组116例接受PF诱导化疗(顺铂80 mg/m2,第1天+氟尿嘧啶750 mg/m2,持续静脉滴注120 h),每3周重复,共3个疗程。诱导化疗结束后行同期放化疗,放疗采用调强适形放疗(intensity modulated radiation therapy,IMRT)技术,大体肿瘤靶区(gross tumor volume,GTV)6810 cGy/30次,5次/周,共6周,同期化疗用顺铂80 mg/m2,第1、22天。评价完全缓解(complete response,CR)、部分缓解(partial response,PR)和有效缓解率(response rate,RR), RR=CR+PR。评价两组患者的近期疗效及不良反应,并随访比较5年无进展生存(progression-free survival,PFS)和5年总生存(overall survival,OS)。结果：诱导化疗结束后和治疗结束后13周TPF组的有效缓解率都高于PF组,两组差异有统计学意义(P=0.001,P=0.002);TPF组中位复发时间为2.98年,5年的PFS为84.48%,PF组中位复发时间为2.32年,5年的PFS为82.75%,差异无统计学意义(P=0.458);TPF组5年的OS为87.06%,PF组5年的OS为85.34%,差异无统计学意义(P=0.274)。TPF组在中性粒细胞下降、血小板下降、肝功能和肾功能损伤、腹泻以及黏膜坏死的发生上均明显高于PF组,差异有统计学意义(P<0.001),TPF组发生Ⅲ度和Ⅳ度不良反应较PF组明显增高,差异有统计学意义(P<0.001)。结论：TPF方案诱导化疗治疗局部晚期鼻咽癌的临床疗效并不优于PF方案诱导化疗治疗局部晚期鼻咽癌,且TPF方案诱导化疗的不良反应较PF方案明显,临床上不适合推广。     

鼻咽癌动态调强放疗计划的剂量学验证

目的建立鼻咽癌动态调强放疗计划的剂量学验证方法。方法对80例鼻咽癌动态调强放疗计划分别进行3个项目的剂量验证一是用电离室在人体等效模体中测量靶区参考点的绝对剂量,二是使用二维电离室矩阵测量调强计划每个射野的剂量强度分布,三是使用慢感光胶片竖插在模体内,测量调强计划横断面的剂量分布。结果92.5%计划靶区参考点的绝对剂量误差小于5%,在改用体积较小的电离室和调整机架角度避开固定装置重新制定计划后,所有计划靶区参考点的绝对剂量误差也都小于5%。有88.1%的照射野剂量分布误差小于3%。结论为了得到更加真实的测量结果,建议所有测量,尤其是绝对剂量测量都在计划实际机架角度下进行。利用二维电离室矩阵可定量分析照射野剂量分布误差,并且省时省力,有利于验证工作的常规化。胶片法验证由于费时费力且误差较大已趋于淘汰。对于动态调强计划,模体计划各个射野的机器跳数(MU)应与实际计划相同,这样才能得到更加真实的测量结果。