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Wickham F, McMeekin H, Burniston M, McCool D, Pencharz D, Skillen A, Wagner T. Patient-specific optimisation of administered activity and acquisition times for 18F-FDG PET imaging. EJNMMI Res 2017; 7:3. [PMID: 28091978 PMCID: PMC5236047 DOI: 10.1186/s13550-016-0250-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 12/16/2016] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The purpose of this study is to identify a method for optimising the administered activity and acquisition time for 18F-FDG PET imaging, yielding images of consistent quality for patients with varying body sizes and compositions, while limiting radiation doses to patients and staff. Patients referred for FDG scans had bioimpedance measurements. They were injected with 3 MBq/kg of 18F up to 370 MBq and scanned on a Siemens Biograph mCT at 3 or 4 min per bed position. Data were rebinned to simulate 2- and 1-min acquisitions. Subjective assessments of image quality made by an experienced physician were compared with objective measurements based on signal-to-noise ratio and noise equivalent counts (NEC). A target objective measure of image quality was identified. The activity and acquisition time required to achieve this were calculated for each subject. Multiple regression analysis was used to identify expressions for the activity and acquisition time required in terms of easily measurable patient characteristics. RESULTS One hundred and eleven patients were recruited, and subjective and objective assessments of image quality were compared for 321 full and reduced time scans. NEC-per-metre was identified as the objective measure which best correlated with the subjective assessment (Spearman rank correlation coefficient 0.77) and the best discriminator for images with a subjective assessment of "definitely adequate" (area under the ROC curve 0.94). A target of 37 Mcount/m was identified. Expressions were identified in terms of patient sex, height and weight for the activity and acquisition time required to achieve this target. Including measurements of body composition in these expressions was not useful. Using these expressions would reduce the mean activity administered to this patient group by 66 MBq compared to the current protocol. CONCLUSIONS Expressions have been identified for the activity and acquisition times required to achieve consistent image quality in FDG imaging with reduced patient and staff doses. These expressions might need to be adapted for other systems and reconstruction protocols.
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Affiliation(s)
- Fred Wickham
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK.
| | - Helena McMeekin
- Hermes Medical Solutions, 22 Long Acre, London, WC2E 9LY, UK
| | - Maria Burniston
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK
| | - Daniel McCool
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK
| | - Deborah Pencharz
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK
| | - Annah Skillen
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK
| | - Thomas Wagner
- Nuclear Medicine Department, Royal Free London NHS Foundation Trust, Pond Street, London, NW3 2QG, UK
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Sakaguchi K, Hosono M, Imamura T, Takahara N, Hayashi M, Yakushiji Y, Ishii K, Uto T, Murakami T. Estimation of activity of administered 18F-fluorodeoxyglucose by measurement of the dose equivalent rate on the right temporal region of the head. EJNMMI Phys 2016; 3:28. [PMID: 27844449 PMCID: PMC5108740 DOI: 10.1186/s40658-016-0164-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 11/01/2016] [Indexed: 12/02/2022] Open
Abstract
Background Positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) is now a routine procedure for the management of cancer patients. Intravenous administration of FDG is sometimes halted due to troubles. In such cases, estimations of the FDG dosage injected prior to halting administration may be helpful. We have established a method of estimating the activity of FDG to patients on the basis of the dose equivalent rate on the surface of the right temporal region of the head. The correlation of actual administered dosage with independent variables, such as the dose equivalent rate on the right temporal region of the head, age, sex, and body weight, was analyzed using multiple regression analysis to obtain linear, quadratic, and cubic regression equations. Results When entering independent variables, the cubic regression equation could be used to estimate an administered dosage with an accuracy of ±10 % for 62 % of all patients and ±20 % for 90 % of all patients. Conclusions We conclude that this method is useful for estimating the administered dosage from the dose equivalent rate on the temporal region of the head.
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Affiliation(s)
- Kenta Sakaguchi
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Faculty of Medicine, Kindai University, 377-2 Ohno-Higashi, Osaka-Sayama, 589-8511, Osaka, Japan
| | - Makoto Hosono
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Faculty of Medicine, Kindai University, 377-2 Ohno-Higashi, Osaka-Sayama, 589-8511, Osaka, Japan. .,Department of Radiology, Faculty of Medicine, Kindai University, Osaka-Sayama, Japan.
| | - Tomomi Imamura
- Division of Nursing, Kindai University Hospital, Osaka-Sayama, Japan
| | - Naomi Takahara
- Division of Nursing, Kindai University Hospital, Osaka-Sayama, Japan
| | - Misa Hayashi
- Division of Nursing, Kindai University Hospital, Osaka-Sayama, Japan
| | - Yuko Yakushiji
- Division of Nursing, Kindai University Hospital, Osaka-Sayama, Japan
| | - Kazunari Ishii
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Faculty of Medicine, Kindai University, 377-2 Ohno-Higashi, Osaka-Sayama, 589-8511, Osaka, Japan.,Department of Radiology, Faculty of Medicine, Kindai University, Osaka-Sayama, Japan
| | - Tatsuro Uto
- Department of Radiology, Faculty of Medicine, Kindai University, Osaka-Sayama, Japan
| | - Takamichi Murakami
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Faculty of Medicine, Kindai University, 377-2 Ohno-Higashi, Osaka-Sayama, 589-8511, Osaka, Japan.,Department of Radiology, Faculty of Medicine, Kindai University, Osaka-Sayama, Japan
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Chen MK, Menard DH, Cheng DW. Determining the Minimal Required Radioactivity of 18F-FDG for Reliable Semiquantification in PET/CT Imaging: A Phantom Study. J Nucl Med Technol 2016; 44:26-30. [PMID: 26769598 DOI: 10.2967/jnmt.115.165258] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 11/17/2015] [Indexed: 01/08/2023] Open
Abstract
UNLABELLED In pursuit of as-low-as-reasonably-achievable (ALARA) doses, this study investigated the minimal required radioactivity and corresponding imaging time for reliable semiquantification in PET/CT imaging. METHODS Using a phantom containing spheres of various diameters (3.4, 2.1, 1.5, 1.2, and 1.0 cm) filled with a fixed (18)F-FDG concentration of 165 kBq/mL and a background concentration of 23.3 kBq/mL, we performed PET/CT at multiple time points over 20 h of radioactive decay. The images were acquired for 10 min at a single bed position for each of 10 half-lives of decay using 3-dimensional list mode and were reconstructed into 1-, 2-, 3-, 4-, 5-, and 10-min acquisitions per bed position using an ordered-subsets expectation maximum algorithm with 24 subsets and 2 iterations and a gaussian 2-mm filter. SUVmax and SUVavg were measured for each sphere. RESULTS The minimal required activity (±10%) for precise SUVmax semiquantification in the spheres was 1.8 kBq/mL for an acquisition of 10 min, 3.7 kBq/mL for 3-5 min, 7.9 kBq/mL for 2 min, and 17.4 kBq/mL for 1 min. The minimal required activity concentration-acquisition time product per bed position was 10-15 kBq/mL⋅min for reproducible SUV measurements within the spheres without overestimation. Using the total radioactivity and counting rate from the entire phantom, we found that the minimal required total activity-time product was 17 MBq⋅min and the minimal required counting rate-time product was 100 kcps⋅min. CONCLUSION Our phantom study determined a threshold for minimal radioactivity and acquisition time for precise semiquantification in (18)F-FDG PET imaging that can serve as a guide in pursuit of achieving ALARA doses.
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Affiliation(s)
- Ming-Kai Chen
- Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, Connecticut
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Cheng DW, Ersahin D, Staib LH, Della Latta D, Giorgetti A, d'Errico F. Using SUV as a guide to 18F-FDG dose reduction. J Nucl Med 2014; 55:1998-2002. [PMID: 25453048 DOI: 10.2967/jnumed.114.140129] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
UNLABELLED This article explores how one can lower the injected (18)F-FDG dose while maintaining validity in comparing standardized uptake values (SUVs) between studies. Variations of the SUV within each lesion were examined at different acquisition times. METHODS Our protocol was approved by either the Human Investigation Committee or the Institutional Review Board. All 120 PET datasets were acquired continuously for 180 s per bed position in list mode and were reconstructed to obtain 30-, 60-, 90-, 120-, 150-, and 180-s-per-bed-position PET images with registration to a single set of nondiagnostic CT images. Qualitative assessment of the images was performed separately for correlation. The SUV measurements of each lesion were computed and normalized to the 180-s acquisition values to create a stabilization factor. These stabilization factors were used to demonstrate a predictable trend of stabilization over time. The variances of the stabilization factors over the entire dataset, composed of several tumor types over a range of sizes, were compared for each time point with the corresponding 150-s time point using a 2-sided F test, which has similar values to the 180-s time point. RESULTS The variance of the data decreased with increasing acquisition time and with increasing dose but leveled off for sufficiently long acquisitions. CONCLUSION Through the statistical analysis of SUVs for increasing acquisition times and visual evaluation of the plots, we developed and hereby propose an algorithm that can be used to seek the maximum reduction in administered (18)F-FDG dose while preserving the validity of SUV comparisons.
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Affiliation(s)
- David W Cheng
- Sidra Medical and Research Center, Department of Diagnostic Imaging, Doha, Qatar
| | - Devrim Ersahin
- Yale University School of Medicine, Department of Diagnostic Radiology, New Haven, Connecticut
| | - Lawrence H Staib
- Yale University School of Medicine, Department of Diagnostic Radiology, New Haven, Connecticut
| | - Daniele Della Latta
- Fondazione Toscana Gabriele Monasterio per la Ricerca Medica e di Sanità Pubblica, CNR-Regione Toscana, Massa, Italy; and
| | - Assuero Giorgetti
- Fondazione Toscana Gabriele Monasterio per la Ricerca Medica e di Sanità Pubblica, CNR-Regione Toscana, Pisa, Italy
| | - Francesco d'Errico
- Yale University School of Medicine, Department of Diagnostic Radiology, New Haven, Connecticut
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Kangai Y, Onishi H, Takigawa A, Yoshikawa K, Sanai H, Mimura H, Yanagimoto S. [Evaluation of potentially influential factors for positron emission tomography image quality in liver signal-to-noise ratio utilizing a delivery ¹⁸F-fluoro-2-deoxy-D-glucose study on Bi₄Ge₃O₁₂-positron emission tomography/computed tomography]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2014; 70:784-92. [PMID: 25142389 DOI: 10.6009/jjrt.2014_jsrt_70.8.784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
UNLABELLED The purpose of this study was to evaluate the relationship of body habitus, blood glucose level and injected dose, respectively, with BGO (Bi₄Ge₃O₁₂) positron emission tomography (PET) image quality using commercially available 2-deoxy-2-[¹⁸F] fluoro-D-glucose (FDG). We also evaluated the relationship between PET image quality and acquisition time for each weight group. METHOD One hundred twenty-five patients (66 male, 59 female) were enrolled in the study. We adopted liver signal-to-noise ratio (liver SNR) as an image quality index, derived from the region of interest (ROI) placed on the axial image of the liver. RESULTS The correlation coefficient between liver SNR and dose per weight was 0.502. The liver SNR indicated a negative relationship with body weight, body mass index (BMI) and cross sectional area of the patient's body, with the correlation coefficients of -0.594, -0.479 and -0.522, respectively. For all weight groups, an extended acquisition time of at least 60 s/bed was necessary to improve liver SNR. CONCLUSION The findings of this study are potentially of use for designing imaging protocols for the BGO-PET/CT system when using commercially available FDG. It is easy to obtain good image quality for patients of low to average body size with the standard injection dose. However, large patients should be injected, wherever possible, with an FDG dose of up to 5 MBq/kg. The acquisition time in overweight and obese patients should be as longer as possible than in standard weight patients.
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