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Biodistribution and Radiation Dosimetry for 68 Ga-DOTA-CCK-66, a Novel CCK 2 R-Targeting Compound for Imaging of Medullary Thyroid Cancer. 用于甲状腺髓样癌成像的新型 CCK2R 靶向化合物 68Ga-DOTA-CCK-66 的生物分布和放射剂量测量法
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-08-02 DOI: 10.1097/RLU.0000000000005355
Oliver Viering, Andreas Rinscheid, Nadine Holzleitner, Alexander Dierks, Malte Kircher, Georgine Wienand, Marianne Patt, Hans-Jürgen Wester, Ralph A Bundschuh, Thomas Günther, Constantin Lapa, Christian H Pfob

Abstract: Cholecystokinin 2 receptor (CCK 2 R) is a promising target for imaging and treatment of medullary thyroid cancer due to its overexpression in over 90% of tumor cells. 68 Ga-DOTA-CCK-66 is a recently introduced PET tracer selective for CCK 2 R, which has shown favorable pharmacokinetics in vivo in preclinical experiments. In order to further investigate safety and suitability of this tracer in the human setting, whole-body distribution and radiation dosimetry were evaluated.

Patients and methods: Six patients with a history of medullary thyroid cancer were injected intravenously with 169 ± 19 MBq of 68 Ga-DOTA-CCK-66. Whole-body PET/CT scans were acquired at 10 minutes, 1 hour, 2 hours, and 4 hours after tracer injection. Time-activity curves per organ were determined, and mean organ-absorbed doses and effective doses were calculated using OLINDA/EXM.

Results: Injection of a standard activity of 150 MBq of 68 Ga-DOTA-CCK-66 results in an effective dose of 4.5 ± 0.9 mSv. The highest absorbed organ doses were observed in the urinary bladder wall (40 mGy) and the stomach (15 mGy), followed by the kidneys (6 mGy), as well as the liver and the spleen (3 mGy each). CCK 2 R-expressing tumor manifestations could be detected in 2 of the 6 patients, including lymph node, bone, and liver metastases.

Conclusions: 68 Ga-DOTA-CCK-66 exhibits a favorable dosimetry. Beyond physiologic receptor expression of the stomach, no other relevant tracer accumulation could be observed, rendering this organ at risk in case of subsequent radioligand therapy using 177 Lu-DOTA-CCK-66.

摘要:由于胆囊收缩素2受体(CCK2R)在90%以上的肿瘤细胞中过表达,因此它是甲状腺髓样癌成像和治疗的一个很有前景的靶点。68Ga-DOTA-CCK-66是最近推出的对CCK2R具有选择性的PET示踪剂,在临床前实验中显示出良好的体内药代动力学。为了进一步研究这种示踪剂在人体环境中的安全性和适用性,我们对其全身分布和辐射剂量进行了评估:六名有甲状腺髓样癌病史的患者静脉注射了 169 ± 19 MBq 的 68Ga-DOTA-CCK-66。在注射示踪剂后 10 分钟、1 小时、2 小时和 4 小时分别进行全身 PET/CT 扫描。确定了每个器官的时间-活性曲线,并使用 OLINDA/EXM 计算了器官吸收的平均剂量和有效剂量:结果:注射标准活性为 150 MBq 的 68Ga-DOTA-CCK-66,有效剂量为 4.5 ± 0.9 mSv。吸收剂量最高的器官是膀胱壁(40 mGy)和胃(15 mGy),其次是肾脏(6 mGy)、肝脏和脾脏(各3 mGy)。6名患者中有2名可以检测到CCK2R表达的肿瘤表现,包括淋巴结、骨和肝转移:结论:68Ga-DOTA-CCK-66具有良好的剂量设计。结论:68Ga-DOTA-CCK-66表现出良好的放射剂量学特性,除了胃部的生理性受体表达外,未观察到其他相关的示踪剂累积,因此在随后使用177Lu-DOTA-CCK-66进行放射性配体治疗时,胃部器官将面临风险。
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引用次数: 0
Lenticulostriatal Ischemia Shows Relevant SSTR Expression on PET/CT Imaging Using the Novel SSTR-Targeting Peptide 18 F-SiTATE. 使用新型 SSTR 靶向肽 18F-SiTATE 进行 PET/CT 成像时,韧皮部缺血显示出相关的 SSTR 表达。
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-10-02 DOI: 10.1097/RLU.0000000000005482
Sophie C Kunte, Lena M Unterrainer, Wolfgang G Kunz, Michael Winkelmann, Simon Lindner, Klaus Jurkschat, Carmen Wängler, Björn Wängler, Ralf Schirrmacher, Peter Bartenstein, Claus Belka, Christian Schichor, Nathalie L Albert, Marcus Unterrainer

Abstract: A 64-year-old woman with meningioma presented with left-sided lenticulostriatal ischemia following craniotomy and debulking of a sphenoid wing meningioma. For subsequent radiotherapy planning, an SSTR-targeted PET/CT using the novel ligand 18 F-SiTATE was performed 2.5 months thereafter. The meningioma remnants showed transosseous, intrasellar, and perivascular extension around the internal carotid artery with strong SSTR expression. Moreover, there was focal 18 F-SiTATE uptake in the left caudate and corresponding contrast enhancement due to postischemic blood-brain barrier disruption and reactive SSTR expression. Therefore, increased cortical or subcortical SSTR PET signal may be related to ischemic changes even in the subacute stage after initial stroke.

摘要:一名64岁的女性脑膜瘤患者在进行开颅手术和蝶骨翼脑膜瘤剥除术后出现左侧脑皮质缺血。为了制定后续放疗计划,她在两个半月后使用新型配体 18F-SiTATE 进行了 SSTR 靶向 PET/CT。脑膜瘤残余显示颈内动脉周围的经骨膜、小脑内和血管周围扩展,并有强烈的SSTR表达。此外,由于缺血后血脑屏障破坏和反应性 SSTR 表达,左侧尾状体出现局灶性 18F-SiTATE 摄取和相应的对比度增强。因此,皮质或皮质下SSTR PET信号的增加可能与缺血性改变有关,即使在脑卒中初期的亚急性阶段也是如此。
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引用次数: 0
Radiation Pneumonitis With 99m Tc-MDP Uptake in a Patient With Breast Cancer. 乳腺癌患者放射性肺炎伴有 99mTc-MDP 摄取
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-10-18 DOI: 10.1097/RLU.0000000000005471
Mohammad Hadi Samadi, Susan Khezri, Faeze Rabani Banou, Mina Bai, Somaye Barashki

Abstract: We present MDP bone scan findings of radiation pneumonitis in a 45-year-old woman with invasive ductal carcinoma of the right breast, classified as stage IIIa, T3N2M0. The patient underwent a modified radical mastectomy, neoadjuvant chemotherapy, and subsequent radiotherapy, receiving the last session 7 months before the bone scan. Whole-body images acquired 3 hours postinjection of 20 mCi (730 MBq) 99m Tc-MDP showed incidentally increased uptake in the right hemithorax, confined to the lung parenchyma of the right lung on SPECT/CT images.

摘要:我们报告了一名患有右乳腺浸润性导管癌(IIIa 期,T3N2M0)的 45 岁女性放射性肺炎的 MDP 骨扫描结果。患者接受了改良根治性乳房切除术、新辅助化疗和后续放疗,最后一次放疗是在骨扫描前 7 个月进行的。注射20 mCi(730 MBq)99mTc-MDP后3小时采集的全身图像显示,右侧半胸腔摄取量意外增加,SPECT/CT图像显示摄取局限于右肺的肺实质。
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引用次数: 0
Burned-Out Testicular Carcinoma Presenting as Inferior Vena Cava Tumor Thrombus With Pulmonary Tumor Embolism on FDG PET/CT: A Case Report. 在 FDG PET/CT 上表现为下腔静脉肿瘤血栓伴肺部肿瘤栓塞的烧伤性睾丸癌:病例报告。
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-07-16 DOI: 10.1097/RLU.0000000000005386
Noa Shani Shrem, Daniel Levin, Keren Rouvinov, Gal Ben-Arie, Ilya Liberzon, Nir Hod

Abstract: "Burned-out" testicular tumor is a very rare clinical phenomenon, which refers to the presence of a metastatic germ cell tumor with no clinical findings in the testicle due to spontaneous regression of the primary testicular lesion. We present an unusual case of burned-out testicular embryonal germ cell carcinoma presenting as an extensive inferior vena cava tumor thrombus with malignant pulmonary embolism in which FDG PET/CT played a pivotal role in detecting the extent and significance of the disease.

摘要:"烧毁性 "睾丸肿瘤是一种非常罕见的临床现象,指的是由于原发睾丸病变自发消退,睾丸出现转移性生殖细胞肿瘤而无临床表现。我们报告了一例不寻常的 "烧毁型 "睾丸胚胎生殖细胞癌病例,该病例表现为广泛的下腔静脉肿瘤血栓并伴有恶性肺栓塞,FDG PET/CT 在检测该疾病的范围和重要性方面发挥了关键作用。
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引用次数: 0
Hot Hearts on Bone Scintigraphy Are Not All Amyloidosis: Hyperoxaluria-Associated Cardiomyopathy. 骨闪烁成像上的 "热心 "并非都是淀粉样变性:高草酸尿症相关心肌病。
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-08-28 DOI: 10.1097/RLU.0000000000005411
Ya-Wen Wang, Yan-Ting Xie, Xiao-Xin Sun

Abstract: A 54-year-old woman with a history of end-stage renal disease was found to have infiltrative cardiomyopathy by echocardiography. 99m Tc-pyrophosphate ( 99m Tc-PYP) scintigraphy was positive with a remarkable myocardial uptake. Gene test found a mutation of AGXT , confirming a final diagnosis of primary hyperoxaluria. Radiotracer uptake was due to high myocardial oxalate deposition. This case illustrates false positivity of the 99m Tc-PYP scan caused by hyperoxaluria-associated cardiomyopathy, which raises awareness for other conditions apart from amyloid cardiomyopathy.

摘要:一名有终末期肾病病史的 54 岁妇女经超声心动图检查发现患有浸润性心肌病。99m锝-焦磷酸(99m锝-PYP)闪烁扫描呈阳性,心肌摄取显著。基因检测发现了 AGXT 突变,最终确诊为原发性高草酸尿症。放射性示踪剂摄取是由于心肌草酸盐沉积过高所致。本病例说明了高草酸血症相关心肌病导致的 99mTc-PYP 扫描假阳性,从而提高了人们对淀粉样变性心肌病以外的其他疾病的认识。
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引用次数: 0
18 F-FDG PET/CT for Detection of Immunotherapy-Induced Hypophysitis-A Case-Control Study. 18F-FDG PET/CT 用于检测免疫疗法诱发的肾上腺皮质功能减退症--一项病例对照研究。
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-09-25 DOI: 10.1097/RLU.0000000000005440
Alessa Fischer, Julia M Martínez-Gómez, Joanna Mangana, Reinhard Dummer, Zoran Erlic, Svenja Nölting, Felix Beuschlein, Alexander Maurer, Michael Messerli, Martin W Huellner, Stephan Skawran

Purpose: Hypophysitis occurs in up to 10% of patients treated with immune-checkpoint inhibitors (ICIs). MRI shows no abnormalities of the pituitary gland in one third of patients. A delayed diagnosis increases the risk for life-threatening adrenal crisis, underscoring the need for early detection. This study evaluates the diagnostic accuracy FDG PET/CT in detecting ICI-induced hypophysitis in a cohort of melanoma patients.

Materials and methods: Patients with metastatic melanoma and ICI-induced hypophysitis, who underwent FDG PET/CT 90 days before to 10 days after diagnosis, were compared with an age- and sex-matched control group of patients undergoing ICI treatment without signs of hypophysitis. The ratio of SUV max of the pituitary gland to the SUV mean of the blood pool (target-to-background ratio [TBR]) was calculated. Diagnostic accuracy of the TBR was assessed using area under the receiver operating characteristics curve analysis.

Results: A total of 28 patients was included. The majority of patients with hypophysitis received ipilimumab/nivolumab (64.3%, 9/14). Visual assessment of the TBR distribution demonstrated a positive correlation with decreasing time to diagnosis. To evaluate diagnostic performance, only patients with FDG PET/CT 50 days before to 8 days after diagnosis (11/14) were included. TBR was significantly higher in these compared with the control group (median [interquartile range], 2.78 [2.41] vs 1.59 [0.70], respectively; P = 0.034). A sensitivity of 72.7% and a specificity of 90.9% were achieved at a TBR threshold of 2.41 (area under the receiver operating characteristics curve = 0.769).

Conclusions: Our findings suggest that, in patients undergoing ICI treatment for metastatic melanoma, a pituitary TBR of approximately 2.4 may indicate impending ICI-induced hypophysitis.

目的:在接受免疫检查点抑制剂(ICIs)治疗的患者中,多达 10% 的患者会出现垂体炎。核磁共振成像显示三分之一的患者垂体无异常。延迟诊断会增加肾上腺危象危及生命的风险,因此需要及早发现。本研究评估了 FDG PET/CT 在一组黑色素瘤患者中检测 ICI 诱导的肾上腺皮质功能减退症的诊断准确性:将在确诊前90天至确诊后10天接受FDG PET/CT检查的转移性黑色素瘤和ICI诱发的肾上腺皮质功能减退症患者与接受ICI治疗但无肾上腺皮质功能减退症症状的年龄和性别匹配的对照组患者进行比较。计算垂体的 SUVmax 与血池的 SUVmean 之比(靶-背景比 [TBR])。采用接收者操作特征曲线下面积分析法评估TBR的诊断准确性:结果:共纳入 28 名患者。大多数肾上腺皮质功能减退症患者接受了伊匹单抗/尼伐单抗治疗(9/14,64.3%)。对TBR分布的目测评估显示,诊断时间的缩短与TBR分布呈正相关。为评估诊断效果,仅纳入了诊断前50天至诊断后8天进行FDG PET/CT检查的患者(11/14)。与对照组相比,这些患者的 TBR 明显更高(中位数[四分位间范围]分别为 2.78 [2.41] vs 1.59 [0.70];P = 0.034)。当 TBR 临界值为 2.41 时,灵敏度为 72.7%,特异度为 90.9%(接收者操作特征曲线下面积 = 0.769):我们的研究结果表明,在接受 ICI 治疗的转移性黑色素瘤患者中,垂体 TBR 约为 2.4 可能预示着 ICI 即将诱发垂体功能减退症。
{"title":"18 F-FDG PET/CT for Detection of Immunotherapy-Induced Hypophysitis-A Case-Control Study.","authors":"Alessa Fischer, Julia M Martínez-Gómez, Joanna Mangana, Reinhard Dummer, Zoran Erlic, Svenja Nölting, Felix Beuschlein, Alexander Maurer, Michael Messerli, Martin W Huellner, Stephan Skawran","doi":"10.1097/RLU.0000000000005440","DOIUrl":"10.1097/RLU.0000000000005440","url":null,"abstract":"<p><strong>Purpose: </strong>Hypophysitis occurs in up to 10% of patients treated with immune-checkpoint inhibitors (ICIs). MRI shows no abnormalities of the pituitary gland in one third of patients. A delayed diagnosis increases the risk for life-threatening adrenal crisis, underscoring the need for early detection. This study evaluates the diagnostic accuracy FDG PET/CT in detecting ICI-induced hypophysitis in a cohort of melanoma patients.</p><p><strong>Materials and methods: </strong>Patients with metastatic melanoma and ICI-induced hypophysitis, who underwent FDG PET/CT 90 days before to 10 days after diagnosis, were compared with an age- and sex-matched control group of patients undergoing ICI treatment without signs of hypophysitis. The ratio of SUV max of the pituitary gland to the SUV mean of the blood pool (target-to-background ratio [TBR]) was calculated. Diagnostic accuracy of the TBR was assessed using area under the receiver operating characteristics curve analysis.</p><p><strong>Results: </strong>A total of 28 patients was included. The majority of patients with hypophysitis received ipilimumab/nivolumab (64.3%, 9/14). Visual assessment of the TBR distribution demonstrated a positive correlation with decreasing time to diagnosis. To evaluate diagnostic performance, only patients with FDG PET/CT 50 days before to 8 days after diagnosis (11/14) were included. TBR was significantly higher in these compared with the control group (median [interquartile range], 2.78 [2.41] vs 1.59 [0.70], respectively; P = 0.034). A sensitivity of 72.7% and a specificity of 90.9% were achieved at a TBR threshold of 2.41 (area under the receiver operating characteristics curve = 0.769).</p><p><strong>Conclusions: </strong>Our findings suggest that, in patients undergoing ICI treatment for metastatic melanoma, a pituitary TBR of approximately 2.4 may indicate impending ICI-induced hypophysitis.</p>","PeriodicalId":10692,"journal":{"name":"Clinical Nuclear Medicine","volume":" ","pages":"e656-e663"},"PeriodicalIF":9.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142342987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
18 F-FDG PET Metabolic Parameters for the Prediction of Histological Response to Induction Chemotherapy in Osteosarcoma and Ewing Sarcoma : A Systematic Review and Network Meta-analysis. 18F-FDG PET 代谢参数用于预测骨肉瘤和尤文肉瘤对诱导化疗的组织学反应:系统综述与网络元分析》。
IF 11.3 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-09-25 DOI: 10.1097/RLU.0000000000005412
Mikhail Yadgarov, Levan Berikashvili, Elena Rakova, Yury Likar

Purpose: This study aimed to evaluate the ability of 18 F-FDG PET/CT metabolic parameters to predict the histological response to neoadjuvant chemotherapy in patients with osteosarcoma and Ewing sarcoma.

Patients and methods: This systematic review and network meta-analysis adhered to the PRISMA-NMA and Cochrane guidelines. Electronic databases were searched from January 2008 to January 2024; this search was supplemented by snowballing methods. The risk of bias was evaluated with QUADAS-2, and evidence certainty was assessed using the GRADE approach. The prognostic value of 18 F-FDG PET/CT parameters, including pretreatment and posttreatment SUVs (SUV1, SUV2 and the SUV2/SUV1 ratio), metabolic tumor volume (MTV1, MTV2, ΔMTV), and total lesion glycolysis (TLG1, TLG2, ΔTLG), was examined.

Results: The meta-analysis of 18 studies (714 patients) identified the ΔTLG, ΔMTV, and SUV ratio as superior predictors of histological response. The changes in metabolic activity, as indicated by these parameters, provided a robust indication of treatment effectiveness. Baseline parameters showed limited predictive value compared with posttreatment assessments. The study's robustness was confirmed through meta-regression, which revealed that the predictive value of the SUV2 and SUV ratio was consistent across various cutoff thresholds.

Conclusions: 18 F-FDG PET/CT metabolic parameters, particularly those measuring changes posttherapy, are effective in predicting the histological response in patients with osteosarcoma and Ewing sarcoma. These findings underscore the potential of 18 F-FDG PET/CT in guiding early treatment decisions, thereby enhancing personalized therapeutic approaches.

目的:本研究旨在评估18F-FDG PET/CT代谢参数预测骨肉瘤和尤文肉瘤患者对新辅助化疗的组织学反应的能力:本系统综述和网络荟萃分析遵循 PRISMA-NMA 和 Cochrane 指南。研究人员检索了 2008 年 1 月至 2024 年 1 月期间的电子数据库,并采用滚雪球法进行补充。使用 QUADAS-2 评估了偏倚风险,并使用 GRADE 方法评估了证据的确定性。研究还考察了18F-FDG PET/CT参数的预后价值,包括治疗前和治疗后的SUV(SUV1、SUV2和SUV2/SUV1比值)、代谢肿瘤体积(MTV1、MTV2、ΔMTV)和总病变糖酵解(TLG1、TLG2、ΔTLG):对18项研究(714名患者)进行的荟萃分析表明,ΔTLG、ΔMTV和SUV比值是预测组织学反应的最佳指标。这些参数所显示的新陈代谢活性的变化为治疗效果提供了可靠的指标。与治疗后评估相比,基线参数的预测价值有限。研究的稳健性通过元回归得到了证实,元回归显示,SUV2 和 SUVratio 的预测价值在不同的截断阈值下是一致的:结论:18F-FDG PET/CT 代谢参数,尤其是测量治疗后变化的参数,能有效预测骨肉瘤和尤文肉瘤患者的组织学反应。这些发现强调了 18F-FDG PET/CT 在指导早期治疗决策方面的潜力,从而加强了个性化治疗方法。
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引用次数: 0
Rare Gastric Metastasis of Lobular Type Breast Cancer Detected With 68 Ga-FAPI-46 PET/CT. 用68Ga-FAPI-46 PET/CT发现罕见的叶状乳腺癌胃转移瘤
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-10-24 DOI: 10.1097/RLU.0000000000005542
Elife Akgun, Omer Faruk Şahin, Mehmetcan Baloglu, Goksel Alcin, Enver Yarikkaya, Esra Arslan

Abstract: Invasive lobular breast cancer (ILBC) is characterized with low tracer uptake on 18 F-FDG PET images. ILBC metastasis to gastrointestinal tract is a rare clinic scenario. We present a case of ILBC who presented with gastric metastasis and diagnosed with 68 Ga-FAPI-46 PET/CT and 18 F-FDG PET/CT images.

摘要:浸润性小叶乳腺癌(ILBC)在18F-FDG PET图像上的示踪剂摄取量较低。ILBC转移至胃肠道在临床上较为罕见。我们报告了一例出现胃转移的ILBC患者,该患者通过68Ga-FAPI-46 PET/CT和18F-FDG PET/CT图像确诊。
{"title":"Rare Gastric Metastasis of Lobular Type Breast Cancer Detected With 68 Ga-FAPI-46 PET/CT.","authors":"Elife Akgun, Omer Faruk Şahin, Mehmetcan Baloglu, Goksel Alcin, Enver Yarikkaya, Esra Arslan","doi":"10.1097/RLU.0000000000005542","DOIUrl":"10.1097/RLU.0000000000005542","url":null,"abstract":"<p><strong>Abstract: </strong>Invasive lobular breast cancer (ILBC) is characterized with low tracer uptake on 18 F-FDG PET images. ILBC metastasis to gastrointestinal tract is a rare clinic scenario. We present a case of ILBC who presented with gastric metastasis and diagnosed with 68 Ga-FAPI-46 PET/CT and 18 F-FDG PET/CT images.</p>","PeriodicalId":10692,"journal":{"name":"Clinical Nuclear Medicine","volume":" ","pages":"e718-e720"},"PeriodicalIF":9.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142544219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fully Automated Region-Specific Human-Perceptive-Equivalent Image Quality Assessment: Application to 18 F-FDG PET Scans. 全自动特定区域人类感知等效图像质量评估:应用于 18F-FDG PET 扫描。
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-10-21 DOI: 10.1097/RLU.0000000000005526
Mehdi Amini, Yazdan Salimi, Ghasem Hajianfar, Ismini Mainta, Elsa Hervier, Amirhossein Sanaat, Arman Rahmim, Isaac Shiri, Habib Zaidi
<p><strong>Introduction: </strong>We propose a fully automated framework to conduct a region-wise image quality assessment (IQA) on whole-body 18 F-FDG PET scans. This framework (1) can be valuable in daily clinical image acquisition procedures to instantly recognize low-quality scans for potential rescanning and/or image reconstruction, and (2) can make a significant impact in dataset collection for the development of artificial intelligence-driven 18 F-FDG PET analysis models by rejecting low-quality images and those presenting with artifacts, toward building clean datasets.</p><p><strong>Patients and methods: </strong>Two experienced nuclear medicine physicians separately evaluated the quality of 174 18 F-FDG PET images from 87 patients, for each body region, based on a 5-point Likert scale. The body regisons included the following: (1) the head and neck, including the brain, (2) the chest, (3) the chest-abdomen interval (diaphragmatic region), (4) the abdomen, and (5) the pelvis. Intrareader and interreader reproducibility of the quality scores were calculated using 39 randomly selected scans from the dataset. Utilizing a binarized classification, images were dichotomized into low-quality versus high-quality for physician quality scores ≤3 versus >3, respectively. Inputting the 18 F-FDG PET/CT scans, our proposed fully automated framework applies 2 deep learning (DL) models on CT images to perform region identification and whole-body contour extraction (excluding extremities), then classifies PET regions as low and high quality. For classification, 2 mainstream artificial intelligence-driven approaches, including machine learning (ML) from radiomic features and DL, were investigated. All models were trained and evaluated on scores attributed by each physician, and the average of the scores reported. DL and radiomics-ML models were evaluated on the same test dataset. The performance evaluation was carried out on the same test dataset for radiomics-ML and DL models using the area under the curve, accuracy, sensitivity, and specificity and compared using the Delong test with P values <0.05 regarded as statistically significant.</p><p><strong>Results: </strong>In the head and neck, chest, chest-abdomen interval, abdomen, and pelvis regions, the best models achieved area under the curve, accuracy, sensitivity, and specificity of [0.97, 0.95, 0.96, and 0.95], [0.85, 0.82, 0.87, and 0.76], [0.83, 0.76, 0.68, and 0.80], [0.73, 0.72, 0.64, and 0.77], and [0.72, 0.68, 0.70, and 0.67], respectively. In all regions, models revealed highest performance, when developed on the quality scores with higher intrareader reproducibility. Comparison of DL and radiomics-ML models did not show any statistically significant differences, though DL models showed overall improved trends.</p><p><strong>Conclusions: </strong>We developed a fully automated and human-perceptive equivalent model to conduct region-wise IQA over 18 F-FDG PET images. Our analysis emphasizes the
简介:我们提出了一种对全身 18F-FDG PET 扫描进行区域图像质量评估(IQA)的全自动框架。该框架(1)可在日常临床图像采集程序中发挥重要作用,即时识别低质量扫描,以便进行潜在的重新扫描和/或图像重建;(2)通过剔除低质量图像和出现伪影的图像,建立干净的数据集,从而在数据集收集方面对人工智能驱动的 18F-FDG PET 分析模型的开发产生重大影响:两名经验丰富的核医学医生分别对 87 名患者的 174 幅 18F-FDG PET 图像进行了质量评估,每个身体区域的评估均采用 5 点李克特量表。身体区域包括(1) 头颈部,包括大脑;(2) 胸部;(3) 胸腹间隙(膈区);(4) 腹部;(5) 骨盆。使用从数据集中随机抽取的 39 个扫描结果计算了质量评分的读片机内和读片机间重现性。通过二值化分类,医生质量评分≤3分和>3分的图像分别被分为低质量和高质量。输入 18F-FDG PET/CT 扫描图像后,我们提出的全自动框架将 2 个深度学习(DL)模型应用于 CT 图像,执行区域识别和全身轮廓提取(不包括四肢),然后将 PET 区域划分为低质量和高质量。在分类方面,研究了 2 种主流的人工智能驱动方法,包括来自放射学特征的机器学习(ML)和深度学习。所有模型均根据每位医生的评分进行训练和评估,并报告评分的平均值。在同一个测试数据集上对 DL 和放射组学-ML 模型进行了评估。使用曲线下面积、准确性、灵敏度和特异性对放射组学-ML 模型和 DL 模型在同一测试数据集上进行了性能评估,并使用德隆检验比较了 P 值 结果:在头颈部、胸部、胸腹间隙、腹部和骨盆区域,最佳模型的曲线下面积、准确性、灵敏度和特异性分别为 [0.97、0.95、0.96 和 0.95]、[0.85、0.82、0.87 和 0.76]、[0.83、0.76、0.68 和 0.80]、[0.73、0.72、0.64 和 0.77]以及[0.72、0.68、0.70 和 0.67]。在所有区域,根据读片机内部重现性较高的质量分数开发的模型性能最高。DL模型和放射组学-ML模型的比较没有显示出任何统计学上的显著差异,但DL模型显示出整体改善的趋势:我们开发了一种全自动、人类可感知的等效模型,用于对 18F-FDG PET 图像进行区域 IQA。我们的分析强调了在 IQA 研究中为身体区域开发单独模型并根据多位专家的共识进行数据注释的必要性。
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引用次数: 0
Value of 68 Ga-DOTATATE PET/CT in Follow-up of Renal Cell Carcinoma With Multiple Atypical Metastatic Sites. 68Ga-DOTATATE PET/CT 在随访伴有多个非典型转移部位的肾细胞癌中的价值
IF 9.6 3区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-12-01 Epub Date: 2024-10-02 DOI: 10.1097/RLU.0000000000005493
Nuh Filizoglu, Salih Ozguven, Tunc Ones, Halil Turgut Turoglu, Tanju Yusuf Erdil

Abstract: The development of late metastatic recurrence after nephrectomy is a well-known characteristic of renal cell carcinoma (RCC). Correct diagnosis is often challenging due to the long time between primary tumor excision and the development of metastases. 68 Ga-DOTATATE PET/CT has the potential to be employed in the follow-up of RCC, because RCC expresses somatostatin receptors. However, limited cases have been reported demonstrating 68 Ga-DOTATATE uptake in the metastases of RCC. Herein, we describe a unique case of RCC with multiple atypical metastatic sites, emphasizing the usefulness of 68 Ga-DOTATATE PET/CT in the evaluation and follow-up of patients with RCC.

摘要:肾切除术后出现晚期转移性复发是肾细胞癌(RCC)的一个众所周知的特征。由于从原发肿瘤切除到发生转移之间的时间较长,正确诊断往往具有挑战性。68Ga-DOTATATE PET/CT 有可能用于 RCC 的随访,因为 RCC 表达体生长抑素受体。然而,显示 RCC 转移灶摄取 68Ga-DOTATATE 的病例报道有限。在此,我们描述了一例具有多个不典型转移部位的独特 RCC 病例,强调了 68Ga-DOTATATE PET/CT 在评估和随访 RCC 患者方面的实用性。
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Clinical Nuclear Medicine
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