scholarly journals The Pons As Region of Reference For Intensity Normalization In Semi-Quantitative Analysis of Brain 18FDG PET: Application to Metabolic Changes Related to Ageing in Conventional and Digital Control Databases

2021 ◽  
Author(s):  
Antoine Verger ◽  
Matthieu Doyen ◽  
Jacques-Yves Campion ◽  
Eric Guedj
Keyword(s):  
Fdg Pet ◽  
Correlation Coefficients ◽  
Metabolic Changes ◽  
18Fdg Pet ◽  
Median Correlation ◽  
Pet Ct ◽  
Digital Pet ◽  
Fdg Pet Ct ◽  
Intensity Normalization ◽  
Two Populations

Abstract Background: To define the most appropriate region for intensity normalization in brain 18FDG PET analysis through ageing.Brain metabolic changes related to ageing were evaluated in two populations of healthy controls who underwent conventional (n=56) or digital (n=78) 18FDG PET/CT. The median correlation coefficients between age and the metabolism of each 120 atlas brain region were reported for 120 distinct intensity normalizations (according to the 120 regions). SPM linear regression analyses with age were performed on most significant normalizations (FWE, p<0.05).Results: The cerebellum and pons were the two sole regions showing median coefficients of correlation with age less than -0.5. With SPM, the intensity normalization through the pons provided at least 1.7- and 2.5-fold more significant cluster volumes than other normalizations for conventional and digital PET respectively. Conclusions: The pons is the most appropriate area for brain 18FDG PET intensity normalization for examining the metabolic changes through ageing.

scholarly journals The pons as reference region for intensity normalization in semi-quantitative analysis of brain 18FDG PET: application to metabolic changes related to ageing in conventional and digital control databases

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Verger ◽  
M. Doyen ◽  
J. Y. Campion ◽  
Eric Guedj
Keyword(s):  
Quantitative Analysis ◽  
Fdg Pet ◽  
Correlation Coefficients ◽  
Absolute Quantification ◽  
Brain Regions ◽  
Metabolic Changes ◽  
18Fdg Pet ◽  
Median Correlation ◽  
Fdg Pet Ct ◽  
Intensity Normalization

Abstract Background The objective of the study is to define the most appropriate region for intensity normalization in brain 18FDG PET semi-quantitative analysis. The best option could be based on previous absolute quantification studies, which showed that the metabolic changes related to ageing affect the quasi-totality of brain regions in healthy subjects. Consequently, brain metabolic changes related to ageing were evaluated in two populations of healthy controls who underwent conventional (n = 56) or digital (n = 78) 18FDG PET/CT. The median correlation coefficients between age and the metabolism of each 120 atlas brain region were reported for 120 distinct intensity normalizations (according to the 120 regions). SPM linear regression analyses with age were performed on most significant normalizations (FWE, p < 0.05). Results The cerebellum and pons were the two sole regions showing median coefficients of correlation with age less than − 0.5. With SPM, the intensity normalization by the pons provided at least 1.7- and 2.5-fold more significant cluster volumes than other normalizations for conventional and digital PET, respectively. Conclusions The pons is the most appropriate area for brain 18FDG PET intensity normalization for examining the metabolic changes through ageing.

scholarly journals Evaluation of radiographic and metabolic changes in bone metastases in response to systemic therapy with 18FDG-PET/CT

2015 ◽  
Vol 49 (2) ◽  
pp. 115-120 ◽  
Author(s):  
Bengul Gunalp ◽  
Ali Ozan Oner ◽  
Semra Ince ◽  
Engin Alagoz ◽  
Aslı Ayan ◽  
...  
Keyword(s):  
Bone Metastases ◽  
Metabolic Activity ◽  
Systemic Therapy ◽  
Fdg Pet ◽  
Therapy Response ◽  
Metabolic Changes ◽  
Metabolic Characteristics ◽  
18Fdg Pet ◽  
Pet Ct ◽  
Fdg Pet Ct

Abstract Background. The aim of the study was to retrospectively evaluate radiographic and metabolic changes in bone metastases in response to systemic therapy with 18FDG-PET/CT and determine their roles on the evaluation of therapy response. Patients and methods. We retrospectively evaluated radiographic and metabolic characteristics of bone metastases in 30 patients who were referred for the evaluation of response to systemic therapy with 18FDG-PET/CT. All patients underwent integrated 18FDG-PET/CT before and after treatment. Results. The baseline radiographic patterns of the target lesions in responders group were lytic, sclerotic, mixed and CT negative; after treatment the radiographic patterns of all target lesions changed to a sclerotic pattern and attenuation increased (p = 0.012) and metabolic activity decreased (p = 0.012). A correlation was found between decreasing metabolic activity and increasing attenuation of the target lesions (r = -0.55) (p = 0.026). Ho wever, in nonresponders group, the baseline radiologic patterns of the target lesions were lytic, blastic, mixed and CT negative; after treatment all lytic target lesions remained the same and one CT negative lesion turned to lytic pattern and the attenuation of the target lesions decreased (p ± 0.12) and metabolic activity increased (p = 0.012). A correlation was found between increasing metabolic activity and decreasing attenuation (r = -0.65) (p = 0.032). An exception of this rule was seen in baseline blastic metastases which progressed with increasing in size, metabolic activity and attenuation. Conclusions. This study shows that the metabolic activity of lesions is a more reliable parameter than the radiographic patterns for the evaluation of therapy response.

Prediction of lymph node metastase in NSCLC

2010 ◽  
Vol 01 (05) ◽  
pp. 219-226 ◽  
Author(s):  
F. Beyer ◽  
B. Buerke ◽  
J. Gerss ◽  
K. Scheffe ◽  
M. Puesken ◽  
...  
Keyword(s):  
Lymph Nodes ◽  
Fdg Pet ◽  
Automatic Segmentation ◽  
Correlation Coefficients ◽  
Mediastinal Lymph Nodes ◽  
Intra Class Correlation ◽  
Axial Diameter ◽  
Pet Ct ◽  
Fdg Pet Ct

SummaryPurpose: To distinguish between benign and malignant mediastinal lymph nodes in patients with NSCLC by comparing 2D and semiautomated 3D measurements in FDG-PET-CT.Patients, material, methods: FDG-PET-CT was performed in 46 patients prior to therapy. 299 mediastinal lymph-nodes were evaluated independently by two radiologists, both manually and by semi-automatic segmentation software. Longest-axial-diameter (LAD), shortest-axial-diameter (SAD), maximal-3D-diameter, elongation and volume were obtained. FDG-PET-CT and clinical/FDG-PET-CT follow up examinations and/or histology served as the reference standard. Statistical analysis encompassed intra-class-correlation-coefficients and receiver-operator-characteristics-curves (ROC). Results: The standard of reference revealed involvement in 87 (29%) of 299 lymph nodes. Manually and semi-automatically measured 2D parameters (LAD and SAD) showed a good correlation with mean

Cortico-Subcortical Metabolic Changes in Aging Brain: A 18F FDG PET/CT Study

2014 ◽  
Vol 1 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Agostino Chiaravalloti ◽  
◽  
Paolo Abbatiello ◽  
Ferdinando Calabria ◽  
Barbara Palumbo ◽  
...  
Keyword(s):  
Fdg Pet ◽  
Metabolic Changes ◽  
Aging Brain ◽  
Pet Ct ◽  
18F Fdg ◽  
Fdg Pet Ct

The effects of chemotherapy on arterial inflammation assessed by 18 FDG PET-CT in patients with Lymphoma

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
E Solomou ◽  
I Koutagiar ◽  
N Ioakimidis ◽  
D Terentes-Printzios ◽  
A Georgakopoulos ◽  
...  
Keyword(s):  
Fdg Pet ◽  
Heart Function ◽  
Specific Treatment ◽  
Chemotherapy Cycle ◽  
Treatment Regimes ◽  
18Fdg Pet ◽  
Pet Ct ◽  
Study Population ◽  
Arterial Inflammation ◽  
Fdg Pet Ct

Abstract Introduction Anti-cancer treatment can lead to increased cardiovascular morbidity among lymphoma survivors. This may be the result of direct effect of treatment on heart function, or indirect acceleration of atherosclerosis. 18F-fluorodeoxyglucose (FDG) uptake is a sensitive and robust marker for assessment of atherosclerotic inflammation. Purpose To investigate the effects of chemotherapy on arterial inflammation using FDG-PET CT in patients with lymphoma. Methods Fifty nine (mean age 58±17 years) patients with Hodgkin (n=39) or non-Hodgkin lymphomas (n=20) underwent 18FDG PET-CT imaging at baseline, interim and after completion of chemotherapy as part of their routine protocol. Arterial inflammation was assessed by arterial target to background ratio (TBR) of the aortic wall along the entire aorta. The index vessel TBR (the vessel with the higher value at baseline) was used for assessment of arterial inflammation. Patients with Hodgkin Lymphomas (HL) underwent therapy with Doxorubicin, bleomycin, vinblastine and dacarbazine (ABVD). The interim of their treatment was set at 1 to 3 days prior to initiating the 3rd chemotherapy cycle. Patients with non Hodgkin Lymphomas (NHL) underwent therapy with cyclophosphamide, doxorubicin, vincristine, and prednisone+rituximab (R-CHOP). The interim of their treatment was set at 2 weeks post the 4th chemotherapy cycle. All patients we reassessed 6 weeks after chemotherapy completion. Results There were no differences in age and atherosclerotic risk factors (hypertension, diabetes, dyslipidemia and smoking), between the two groups (all P&gt;0.05). Similarly, there were no differences in mean (±SD) index vessel TBR between HL and NHL patients (2.4±0.7 vs 2.7±0.9, respectively, P=0.65). In the whole study population the index vessel TBR progressively decreased after the end of therapy (by 0.53±0.11, from baseline to 6 weeks following the end of therapies) (F=10.94, P&lt;0.001, ANOVA). The index vessel TBR decreased in both HL and NHL patients at 6 weeks after therapy compared to baseline level (all P&lt;0.01, ANOVA, figure). The decrease at the interim scan was more pronounced in NHL compared to HL patients, however at 6 weeks after chemotherapy completion the index vessel TBR decreased further in patients with HL, while it increased slightly compared to interim levels in NHL patients (figure 1). Conclusion Arterial inflammation is reduced during and post-chemotherapy in patients with lymphoma. The index vessel TBR changes at the interim phase and 6 weeks after therapy completion indicate a different effect of specific treatment regimes in arterial inflammation between HL and NHL patients. Figure 1 Funding Acknowledgement Type of funding source: None

scholarly journals NGHIÊN CỨU GIÁ TRỊ CỦA 18FDG PET/CT DỰ ĐOÁN TÌNH TRẠNG ĐỘT BIẾN GEN EGFR Ở BỆNH NHÂN UNG THƯ PHỔI BIỂU MÔ TUYẾN

2022 ◽  
Vol 509 (1) ◽  
Author(s):  
Bùi Tiến Công ◽  
Phạm Văn Thái ◽  
Phạm Cẩm Phương ◽  
Đồng Thị Hằng ◽  
Phạm Văn Tuyến ◽  
...  
Keyword(s):  
Fdg Pet ◽  
18Fdg Pet ◽  
Pet Ct ◽  
Fdg Pet Ct

Mục tiêu nghiên cứu: Nghiên cứu giá trị của FDG PET/CT dự đoán tình trạng đột biến EGFR ở bệnh nhân ung thư phổi biểu mô tuyến. Đối tượng và phương pháp nghiên cứu: 114 bệnh nhân ung thư biểu mô tuyến của phổi giai đoạn IIIb, IV được chụp FDG PET/CT, xét nghiệm EGFR trước điều trị từ 11/2018 đến 07/2020. Kết quả: Độ tuổi trung bình 62,3± 8,4, tỷ lệ nam (63,2%) nữ (36,8%), giai đoạn IIIb (43,0%) và giai đoạn IV (57,0%). 43,0% bệnh nhân nghiên cứu không bộc lộ PD L1, 57,0% BN nghiên cứu có kết quả xét nghiệm PD L1 dương tính mức độ yếu đến mạnh.  Tỉ lệ đột biến gen EGFR và tỷ lệ không có đột biến tương ứng 55,3% và 44,7%. Giá trị SUVmax tại khối u phổi nguyên phát ở nhóm EGFR dương tính (11,2 ±5,7) thấp hơn có ý nghĩa thống kê so với nhóm EGFR âm tính (15,8±6,2) (p=0,04). Sử dụng biểu đồ ROC cho thấy, diện tích dưới đường cong (AUC) của SUVmax trong chẩn đoán EGFR dương tính là 0,654 (p<0,05). Kết hợp 4 yếu tố SUVmax, giới, tiền sử lá hút thuốc, cho kết quả chẩn đoán EGFR dương tính tốt hơn, cụ thể diện tích dưới đường cong (AUC) của 4 yếu tố là 0,706 (p<0,05). Kết luận: Đặc điểm FDG PET/CT có mối liên quan và có giá trị dự đoán tình trạng đột biến EGFR ở bệnh nhân ung thư biểu mô tuyến của phổi

scholarly journals Evaluation of 18F-FDG PET/CT Images Acquired with a Reduced Scan Time Duration in Lymphoma Patients using the Digital Biograph Vision

2020 ◽  
Author(s):  
Manuel Weber ◽  
Walter Jentzen ◽  
Regina Hofferber ◽  
Ken Herrmann ◽  
Wolfgang Peter Fendler ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Fdg Pet ◽  
Diagnostic Performance ◽  
Systemic Treatment ◽  
Time Duration ◽  
Tracer Activity ◽  
Scan Time ◽  
Pet Ct ◽  
Digital Pet ◽  
Fdg Pet Ct

Abstract Background: The superior accuracy and sensitivity of 18F-FDG-PET/CT in comparison to morphological imaging alone leads to an upstaging in up to 30 % of lymphoma patients. Novel digital PET/CT scanners might enable to reduce administered tracer activity or scan time duration while maintaining diagnostic performance; this might allow for a higher patient throughput or a reduced radiation exposure, respectively. In particular, the radiation exposure reduction is of interest due to the often young age and high remission rate of lymphoma patients.Methods: Twenty patients with (suspected) lymphoma (6 for initial staging, 12 after systemic treatment, 2 in suspicion of recurrence) sequentially underwent 18F-FDG-PET/CT examinations on a digital PET/CT (Siemens Biograph Vision) with a total scan time duration of 15 minutes (reference acquisition protocol) and 5 minutes (reduced acquisition protocol) using continuous-bed-motion. Both data sets were reconstructed using either standalone time of flight (TOF) or in combination with point spread function (PSF), each with 2 and 4 iterations. Lesion detectability by blinded assessment (separately for supra- and infradiaphragmal nodal lesions and for extranodal lesions), lesion image quantification, and image noise were used as metrics to assess diagnostic performance. Additionally, Deauville Score was compared for all patients after systemic treatment.Results: All defined regions were correctly classified in the images acquired with reduced emission time, and therefore, no changes in staging were observed. Lesion quantification was acceptable, that is, mean absolute percentage deviation of maximum and peak standardized uptake values were 6.8% and 6.4% (derived from 30 lesions). A threefold reduction of scan time duration led to an increase in image noise from 7.1% to 11.0% (images reconstructed with 4 iterations) and from 4.7% to 7.2% (images reconstructed with 2 iterations). No deviations in Deauville Score were observed.Conclusion: These results suggest that scan time duration or administered tracer activity can be reduced threefold without compromising diagnostic performance. Especially a reduction of administered activity might allow for a lower radiation exposure and better health economics. Larger trials are warranted to confirm our results.

scholarly journals Evaluation of 18F-FDG PET/CT images acquired with a reduced scan time duration in lymphoma patients using the digital biograph vision

BMC Cancer ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Manuel Weber ◽  
Walter Jentzen ◽  
Regina Hofferber ◽  
Ken Herrmann ◽  
Wolfgang Peter Fendler ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Fdg Pet ◽  
Diagnostic Performance ◽  
Systemic Treatment ◽  
Time Duration ◽  
Tracer Activity ◽  
Scan Time ◽  
Pet Ct ◽  
Digital Pet ◽  
Fdg Pet Ct

Abstract Background The superior accuracy and sensitivity of 18F-FDG-PET/CT in comparison to morphological imaging alone leads to an upstaging in up to 30% of lymphoma patients. Novel digital PET/CT scanners might enable to reduce administered tracer activity or scan time duration while maintaining diagnostic performance; this might allow for a higher patient throughput or a reduced radiation exposure, respectively. In particular, the radiation exposure reduction is of interest due to the often young age and high remission rate of lymphoma patients. Methods Twenty patients with (suspected) lymphoma (6 for initial staging, 12 after systemic treatment, 2 in suspicion of recurrence) sequentially underwent 18F-FDG-PET/CT examinations on a digital PET/CT (Siemens Biograph Vision) with a total scan time duration of 15 min (reference acquisition protocol) and 5 min (reduced acquisition protocol) using continuous-bed-motion. Both data sets were reconstructed using either standalone time of flight (TOF) or in combination with point spread function (PSF), each with 2 and 4 iterations. Lesion detectability by blinded assessment (separately for supra- and infradiaphragmal nodal lesions and for extranodal lesions), lesion image quantification, and image noise were used as metrics to assess diagnostic performance. Additionally, Deauville Score was compared for all patients after systemic treatment. Results All defined regions were correctly classified in the images acquired with reduced emission time, and therefore, no changes in staging were observed. Lesion quantification was acceptable, that is, mean absolute percentage deviation of maximum and peak standardized uptake values were 6.8 and 6.4% (derived from 30 lesions). A threefold reduction of scan time duration led to an increase in image noise from 7.1 to 11.0% (images reconstructed with 4 iterations) and from 4.7 to 7.2% (images reconstructed with 2 iterations). No deviations in Deauville Score were observed. Conclusion These results suggest that scan time duration or administered tracer activity can be reduced threefold without compromising diagnostic performance. Especially a reduction of administered activity might allow for a lower radiation exposure and better health economics. Larger trials are warranted to confirm our results.

How to choose PET-CT or CT in the diagnosis and staging of lung cancer

2010 ◽  
Vol 01 (05) ◽  
pp. 213-218
Author(s):  
X. Tao ◽  
H. Liu ◽  
T. Jiang ◽  
X. Zheng ◽  
S. Liu
Keyword(s):  
Lymph Nodes ◽  
Fdg Pet ◽  
Automatic Segmentation ◽  
Correlation Coefficients ◽  
Mediastinal Lymph Nodes ◽  
Intra Class Correlation ◽  
Axial Diameter ◽  
Pet Ct ◽  
Fdg Pet Ct

SummaryPurpose: To distinguish between benign and malignant mediastinal lymph nodes in patients with NSCLC by comparing 2D and semiautomated 3D measurements in FDG-PET-CT. Patients, material, methods: FDG-PET-CT was performed in 46 patients prior to therapy. 299 mediastinal lymph-nodes were evaluated independently by two radiologists, both manually and by semi-automatic segmentation software. Longest-axial-diameter (LAD), shortest-axial-diameter (SAD), maximal-3D-diameter, elongation and volume were obtained. FDG-PET-CT and clinical/FDG-PET-CT follow up examinations and/or histology served as the reference standard. Statistical analysis encompassed intra-class-correlation-coefficients and receiver-operator-characteristics-curves (ROC). Results: The standard of reference revealed involvement in 87 (29%) of 299 lymph nodes. Manually and semi-automatically measured 2D parameters (LAD and SAD) showed a good correlation with mean

scholarly journals Revisiting the Marrow Metabolic Changes after Chemotherapy in Lymphoma: A Step towards Personalized Care

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Bingfeng Tang ◽  
Malaykumar M. Patel ◽  
Regina H. Wong ◽  
Daniel Wood ◽  
Christiana O. Wong ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Fdg Pet ◽  
Bone Marrow Involvement ◽  
Standardized Uptake Value ◽  
B Cell Lymphoma ◽  
Metabolic Changes ◽  
Personalized Care ◽  
Pet Ct ◽  
Maximal Standardized Uptake Value ◽  
Fdg Pet Ct

Purpose. The aims were to correlate individual marrow metabolic changes after chemotherapy with bone marrow biopsy (BMBx) for its potential value of personalized care in lymphoma. Methods. 26 patients (mean age, 58 ± 15 y; 13 female, 13 male) with follicular lymphoma or diffuse large B-cell lymphoma, referred to FDG-PET/CT imaging, who had BMBx from unilateral or bilateral iliac crest(s) before chemotherapy, were studied retrospectively. The maximal standardized uptake value (SUV) was measured from BMBx site over the same area on both initial staging and first available restaging FDG-PET/CT scan. Results. 35 BMBx sites in 26 patients were evaluated. 12 of 35 sites were BMBx positive with interval decrease in SUV in 11 of 12 sites (92%). The remaining 23 of 35 sites were BMBx negative with interval increase in SUV in 21 of 23 sites (91%). The correlation between SUV change over the BMBx site before and after chemotherapy and BMBx result was significant (P<0.0001). Conclusions. This preliminary result demonstrates a strong correlation between marrow metabolic changes (as determined by FDG PET) after chemotherapy and bone marrow involvement proven by biopsy. This may provide a retrospective means of personalized management of marrow involvement in deciding whether to deliver more extended therapy or closer followup of lymphoma patients.

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