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Ratnakumaran R, Mohajer J, Withey SJ, H. Brand D, Lee E, Loblaw A, Tolan S, van As N, Tree AC. Developing and validating a simple urethra surrogate model to facilitate dosimetric analysis to predict genitourinary toxicity. Clin Transl Radiat Oncol 2024; 46:100769. [PMID: 38586079 PMCID: PMC10998036 DOI: 10.1016/j.ctro.2024.100769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/08/2024] [Accepted: 03/23/2024] [Indexed: 04/09/2024] Open
Abstract
Purpose The urethra is a critical structure in prostate radiotherapy planning; however, it is impossible to visualise on CT. We developed a surrogate urethra model (SUM) for CT-only planning workflow and tested its geometric and dosimetric performance against the MRI-delineated urethra (MDU). Methods The SUM was compared against 34 different MDUs (within the treatment PTV) in patients treated with 36.25Gy (PTV)/40Gy (CTV) in 5 fractions as part of the PACE-B trial. To assess the surrogate's geometric performance, the Dice similarity coefficient (DSC), Hausdorff distance (HD), mean distance to agreement (MDTA) and the percentage of MDU outside the surrogate (UOS) were calculated. To evaluate the dosimetric performance, a paired t-test was used to calculate the mean of differences between the MDU and SUM for the D99, D98, D50, D2 and D1. The D(n) is the dose (Gy) to n% of the urethra. Results The median results showed low agreement on DSC (0.32; IQR 0.21-0.41), but low distance to agreement, as would be expected for a small structure (HD 8.4mm (IQR 7.1-10.1mm), MDTA 2.4mm (IQR, 2.2mm-3.2mm)). The UOS was 30% (IQR, 18-54%), indicating nearly a third of the urethra lay outside of the surrogate. However, when comparing urethral dose between the MDU and SUM, the mean of differences for D99, D98 and D95 were 0.12Gy (p=0.57), 0.09Gy (p=0.61), and 0.11Gy (p=0.46) respectively. The mean of differences between the D50, D2 and D1 were 0.08Gy (p=0.04), 0.09Gy (p=0.02) and 0.1Gy (p=0.01) respectively, indicating good dosimetric agreement between MDU and SUM. Conclusion While there were geometric differences between the MDU and SUM, there was no clinically significant difference between urethral dose-volume parameters. This surrogate model could be validated in a larger cohort and then used to estimate the urethral dose on CT planning scans in those without an MRI planning scan or urinary catheter.
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Affiliation(s)
- Ragu Ratnakumaran
- The Royal Marsden NHS Foundation Trust, London, UK
- Radiotherapy and Imaging Division, Institute of Cancer Research, London, UK
| | | | | | - Douglas H. Brand
- Department of Medical Physics and Bioengineering, University College London, UK
| | - Ernest Lee
- The Royal Marsden NHS Foundation Trust, London, UK
| | - Andrew Loblaw
- Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Shaun Tolan
- The Clatterbridge Cancer Centre, Liverpool, UK
| | - Nicholas van As
- The Royal Marsden NHS Foundation Trust, London, UK
- Radiotherapy and Imaging Division, Institute of Cancer Research, London, UK
| | - Alison C. Tree
- The Royal Marsden NHS Foundation Trust, London, UK
- Radiotherapy and Imaging Division, Institute of Cancer Research, London, UK
| | - on behalf of the PACE Trial Investigators
- The Royal Marsden NHS Foundation Trust, London, UK
- Radiotherapy and Imaging Division, Institute of Cancer Research, London, UK
- Department of Medical Physics and Bioengineering, University College London, UK
- Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- The Clatterbridge Cancer Centre, Liverpool, UK
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O'Shea R, Withey SJ, Owczarczyk K, Rookyard C, Gossage J, Godfrey E, Jobling C, Parsons SL, Skipworth RJE, Goh V. Multicentre validation of CT grey-level co-occurrence matrix features for overall survival in primary oesophageal adenocarcinoma. Eur Radiol 2024:10.1007/s00330-024-10666-y. [PMID: 38526750 DOI: 10.1007/s00330-024-10666-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 01/29/2024] [Accepted: 02/06/2024] [Indexed: 03/27/2024]
Abstract
BACKGROUND Personalising management of primary oesophageal adenocarcinoma requires better risk stratification. Lack of independent validation of proposed imaging biomarkers has hampered clinical translation. We aimed to prospectively validate previously identified prognostic grey-level co-occurrence matrix (GLCM) CT features for 3-year overall survival. METHODS Following ethical approval, clinical and contrast-enhanced CT data were acquired from participants from five institutions. Data from three institutions were used for training and two for testing. Survival classifiers were modelled on prespecified variables ('Clinical' model: age, clinical T-stage, clinical N-stage; 'ClinVol' model: clinical features + CT tumour volume; 'ClinRad' model: ClinVol features + GLCM_Correlation and GLCM_Contrast). To reflect current clinical practice, baseline stage was also modelled as a univariate predictor ('Stage'). Discrimination was assessed by area under the receiver operating curve (AUC) analysis; calibration by Brier scores; and clinical relevance by thresholding risk scores to achieve 90% sensitivity for 3-year mortality. RESULTS A total of 162 participants were included (144 male; median 67 years [IQR 59, 72]; training, 95 participants; testing, 67 participants). Median survival was 998 days [IQR 486, 1594]. The ClinRad model yielded the greatest test discrimination (AUC, 0.68 [95% CI 0.54, 0.81]) that outperformed Stage (ΔAUC, 0.12 [95% CI 0.01, 0.23]; p = .04). The Clinical and ClinVol models yielded comparable test discrimination (AUC, 0.66 [95% CI 0.51, 0.80] vs. 0.65 [95% CI 0.50, 0.79]; p > .05). Test sensitivity of 90% was achieved by ClinRad and Stage models only. CONCLUSIONS Compared to Stage, multivariable models of prespecified clinical and radiomic variables yielded improved prediction of 3-year overall survival. CLINICAL RELEVANCE STATEMENT Previously identified radiomic features are prognostic but may not substantially improve risk stratification on their own. KEY POINTS • Better risk stratification is needed in primary oesophageal cancer to personalise management. • Previously identified CT features-GLCM_Correlation and GLCM_Contrast-contain incremental prognostic information to age and clinical stage. • Compared to staging, multivariable clinicoradiomic models improve discrimination of 3-year overall survival.
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Affiliation(s)
- Robert O'Shea
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Samuel J Withey
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
- Department of Radiology, Royal Marsden Hospital NHS Trust, Sutton, Surrey, UK
| | - Kasia Owczarczyk
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
- Department of Clinical Oncology, Guy's & St Thomas' Hospitals NHS Foundation Trust, London, UK
| | - Christopher Rookyard
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - James Gossage
- Department of Surgery, Guy's & St Thomas' Hospitals NHS Foundation Trust, London, UK
| | - Edmund Godfrey
- Department of Radiology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Craig Jobling
- Department of Radiology, Nottingham University Hospitals NHS Foundation Trust, Nottingham, UK
| | - Simon L Parsons
- Department of Surgery, Nottingham University Hospitals NHS Foundation Trust, Nottingham, UK
| | | | - Vicky Goh
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.
- Department of Radiology, Guy's & St Thomas' Hospitals NHS Foundation Trust, Westminster Bridge Road, London, SE1 7EG, UK.
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Withey SJ, Owczarczyk K, Grzeda MT, Yip C, Deere H, Green M, Maisey N, Davies AR, Cook GJ, Goh V. Association of dynamic contrast-enhanced MRI and 18F-Fluorodeoxyglucose PET/CT parameters with neoadjuvant therapy response and survival in esophagogastric cancer. Eur J Surg Oncol 2023; 49:106934. [PMID: 37183047 PMCID: PMC10769883 DOI: 10.1016/j.ejso.2023.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 04/17/2023] [Accepted: 05/09/2023] [Indexed: 05/16/2023]
Abstract
INTRODUCTION Better predictive markers are needed to deliver individualized care for patients with primary esophagogastric cancer. This exploratory study aimed to assess whether pre-treatment imaging parameters from dynamic contrast-enhanced MRI and 18F-fluorodeoxyglucose (18F-FDG) PET/CT are associated with response to neoadjuvant therapy or outcome. MATERIALS AND METHODS Following ethical approval and informed consent, prospective participants underwent dynamic contrast-enhanced MRI and 18F-FDG PET/CT prior to neoadjuvant chemotherapy/chemoradiotherapy ± surgery. Vascular dynamic contrast-enhanced MRI and metabolic 18F-FDG PET parameters were compared by tumor characteristics using Mann Whitney U test and with pathological response (Mandard tumor regression grade), recurrence-free and overall survival using logistic regression modelling, adjusting for predefined clinical variables. RESULTS 39 of 47 recruited participants (30 males; median age 65 years, IQR: 54, 72 years) were included in the final analysis. The tumor vascular-metabolic ratio was higher in patients remaining node positive following neoadjuvant therapy (median tumor peak enhancement/SUVmax ratio: 0.052 vs. 0.023, p = 0.02). In multivariable analysis adjusted for age, gender, pre-treatment tumor and nodal stage, peak enhancement (highest gadolinium concentration value prior to contrast washout) was associated with pathological tumor regression grade. The odds of response decreased by 5% for each 0.01 unit increase (OR 0.95; 95% CI: 0.90, 1.00, p = 0.04). No 18F-FDG PET/CT parameters were predictive of pathological tumor response. No relationships between pre-treatment imaging and survival were identified. CONCLUSION Pre-treatment esophagogastric tumor vascular and metabolic parameters may provide additional information in assessing response to neoadjuvant therapy.
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Affiliation(s)
- Samuel J Withey
- Department of Radiology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Kasia Owczarczyk
- Department of Clinical Oncology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Mariusz T Grzeda
- School of Biomedical Engineering & Imaging Sciences, King's College London, United Kingdom
| | - Connie Yip
- Department of Radiation Oncology, National Cancer Centre, Singapore
| | - Harriet Deere
- Department of Pathology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Mike Green
- Department of Pathology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Nick Maisey
- Department of Medical Oncology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Andrew R Davies
- Department of Surgery, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom
| | - Gary J Cook
- School of Biomedical Engineering & Imaging Sciences, King's College London, United Kingdom; The King's College London and Guy's and St Thomas' PET Centre, St Thomas' Hospital, London, United Kingdom
| | - Vicky Goh
- Department of Radiology, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, United Kingdom; School of Biomedical Engineering & Imaging Sciences, King's College London, United Kingdom.
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Withey SJ, Goh V, Foley KG. State-of-the-art imaging in oesophago-gastric cancer. Br J Radiol 2022; 95:20220410. [PMID: 35671095 PMCID: PMC10996959 DOI: 10.1259/bjr.20220410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 11/05/2022] Open
Abstract
Radiological investigations are essential in the management of oesophageal and gastro-oesophageal junction cancers. The current multimodal combination of CT, 18F-fluorodeoxyglucose positron emission tomography combined with CT (PET/CT) and endoscopic ultrasound (EUS) has limitations, which hinders the prognostic and predictive information that can be used to guide optimum treatment decisions. Therefore, the development of improved imaging techniques is vital to improve patient management. This review describes the current evidence for state-of-the-art imaging techniques in oesophago-gastric cancer including high resolution MRI, diffusion-weighted MRI, dynamic contrast-enhanced MRI, whole-body MRI, perfusion CT, novel PET tracers, and integrated PET/MRI. These novel imaging techniques may help clinicians improve the diagnosis, staging, treatment planning, and response assessment of oesophago-gastric cancer.
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Affiliation(s)
- Samuel J Withey
- Department of Radiology, The Royal Marsden NHS Foundation
Trust, London,
UK
| | - Vicky Goh
- Cancer Imaging, School of Biomedical Engineering & Imaging
Sciences, King’s College London,
London, UK
- Department of Radiology, Guy’s and St Thomas’ NHS
Foundation Trust, London,
UK
| | - Kieran G Foley
- Division of Cancer & Genetics, School of Medicine, Cardiff
University, Wales,
UK
- Department of Radiology, Velindre Cancer Centre,
Cardiff, UK
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Withey SJ, Christodoulou D, Prezzi D, Rottenberg G, Sit C, Ul-Hassan F, Carroll P, Velusamy A, Izatt L, Nair R, Jacques AET. Bladder paragangliomas: a pictorial review. Abdom Radiol (NY) 2022; 47:1414-1424. [PMID: 35157102 DOI: 10.1007/s00261-022-03443-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/02/2022] [Accepted: 02/03/2022] [Indexed: 01/20/2023]
Abstract
Bladder paragangliomas (bPGL) are rare neuroendocrine tumors arising from the sympathetic paraganglia present in the bladder wall. Bladder PGLs are typically submucosal or intramural but when subserosal may not be readily visible at cystoscopy. The average size at presentation is 3.9 cm (range 1.0-9.1 cm). When small, bPGL are usually spherical, well-marginated and homogeneous. Larger bPGL are typically more complex with peri- and intra-tumoral neovascularity and central necrosis. On ultrasound, increased color Doppler signal is typical. The increased soft tissue resolution of MRI enables localization of bPGL within the bladder wall more accurately than CT. Restricted diffusion and avid contrast enhancement help differentiate small bPGLs from leiomyomas, which have similar appearances on ultrasound and CT. Nuclear medicine techniques identify bPGLs and their metastases with high specificity, 68Ga-DOTATATE PET/CT having largely replaced 123I-mIBG SPECT/CT as the first line functional investigation. Imaging is essential to aid surgical planning, as endoscopic resection is often not possible or incomplete due to tumor location. For patients with advanced disease, 68Ga-DOTATATE PET/CT and 123I-mIBG SPECT/CT assess suitability for peptide receptor radionuclide therapy. Up to 63% of bPGL patients have a germline mutation, most commonly in the SDHB subunit gene, increasing their risk of developing pheochromocytomas and further paragangliomas; lifelong annual biochemical and periodic imaging screening from skull base to pelvis is therefore recommended.
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Sharkey AR, Sah BR, Withey SJ, Bhuva S, Neji R, Jeljeli S, Green A, Cook GJR, Goh V. Initial experience in staging primary oesophageal/gastro-oesophageal cancer with 18F-FDG PET/MRI. Eur J Hybrid Imaging 2021; 5:23. [PMID: 34897589 PMCID: PMC8666393 DOI: 10.1186/s41824-021-00117-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 11/03/2021] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND 18F-fluorodeoxyglucose positron emission tomography/magnetic resonance imaging (18F-FDG PET/MRI) may improve cancer staging by combining sensitive cancer detection with high-contrast resolution and detail. We compared the diagnostic performance of 18F-FDG PET/MRI to 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) for staging oesophageal/gastro-oesophageal cancer. Following ethical approval and informed consent, participants with newly diagnosed primary oesophageal/gastro-oesophageal cancer were enrolled. Exclusions included prior/concurrent malignancy. Following 324 ± 28 MBq 18F-FDG administration and 60-min uptake, PET/CT was performed, immediately followed by integrated PET/MRI from skull base to mid-thigh. PET/CT was interpreted by two dual-accredited nuclear medicine physicians and PET/MRI by a dual-accredited nuclear medicine physician/radiologist and cancer radiologist in consensus. Per-participant staging was compared with the tumour board consensus staging using the McNemar test, with statistical significance at 5%. RESULTS Out of 26 participants, 22 (20 males; mean ± SD age 68.8 ± 8.7 years) completed 18F-FDG PET/CT and PET/MRI. Compared to the tumour board, the primary tumour was staged concordantly in 55% (12/22) with PET/MRI and 36% (8/22) with PET/CT; the nodal stage was concordant in 45% (10/22) with PET/MRI and 50% (11/22) with PET/CT. There was no statistical difference in PET/CT and PET/MRI staging performance (p > 0.05, for T and N staging). The staging of distant metastases was concordant with the tumour board in 95% (21/22) with both PET/MRI and PET/CT. Of participants with distant metastatic disease, PET/MRI detected additional metastases in 30% (3/10). CONCLUSION In this preliminary study, compared to 18F-FDG PET/CT, 18F-FDG PET/MRI showed non-significant higher concordance with T-staging, but no difference with N or M-staging. Additional metastases detected by 18F-FDG PET/MRI may be of additive clinical value.
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Affiliation(s)
- Amy R Sharkey
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
| | - Bert-Ram Sah
- Department of Diagnostic, Interventional, and Pediatric Radiology, Inselspital, University of Bern, Bern, Switzerland
| | - Samuel J Withey
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Shaheel Bhuva
- King's College London and Guy's and St Thomas' PET Centre, St Thomas' Hospital, London, UK
| | - Radhouene Neji
- MR Research Collaborations, Siemens Healthcare, Frimley, UK
| | - Sami Jeljeli
- King's College London and Guy's and St Thomas' PET Centre, St Thomas' Hospital, London, UK
| | - Adrian Green
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Gary J R Cook
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
- King's College London and Guy's and St Thomas' PET Centre, St Thomas' Hospital, London, UK
| | - Vicky Goh
- Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, UK
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Withey SJ, Amlani A. The Added Value of Dynamic Contrast-enhanced Sequences in Prostate MRI. Radiol Imaging Cancer 2020; 2:e209031. [PMID: 33778745 PMCID: PMC7983763 DOI: 10.1148/rycan.2020209031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
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9
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Annarumma M, Withey SJ, Bakewell RJ, Pesce E, Goh V, Montana G. Automated Triaging of Adult Chest Radiographs with Deep Artificial Neural Networks. Radiology 2019; 291:272. [PMID: 30897046 DOI: 10.1148/radiol.2019194005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Annarumma M, Withey SJ, Bakewell RJ, Pesce E, Goh V, Montana G. Automated Triaging of Adult Chest Radiographs with Deep Artificial Neural Networks. Radiology 2019; 291:196-202. [PMID: 30667333 DOI: 10.1148/radiol.2018180921] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Purpose To develop and test an artificial intelligence (AI) system, based on deep convolutional neural networks (CNNs), for automated real-time triaging of adult chest radiographs on the basis of the urgency of imaging appearances. Materials and Methods An AI system was developed by using 470 388 fully anonymized institutional adult chest radiographs acquired from 2007 to 2017. The free-text radiology reports were preprocessed by using an in-house natural language processing (NLP) system modeling radiologic language. The NLP system analyzed the free-text report to prioritize each radiograph as critical, urgent, nonurgent, or normal. An AI system for computer vision using an ensemble of two deep CNNs was then trained by using labeled radiographs to predict the clinical priority from radiologic appearances only. The system's performance in radiograph prioritization was tested in a simulation by using an independent set of 15 887 radiographs. Prediction performance was assessed with the area under the receiver operating characteristic curve; sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were also determined. Nonparametric testing of the improvement in time to final report was determined at a nominal significance level of 5%. Results Normal chest radiographs were detected by our AI system with a sensitivity of 71%, specificity of 95%, PPV of 73%, and NPV of 94%. The average reporting delay was reduced from 11.2 to 2.7 days for critical imaging findings (P < .001) and from 7.6 to 4.1 days for urgent imaging findings (P < .001) in the simulation compared with historical data. Conclusion Automated real-time triaging of adult chest radiographs with use of an artificial intelligence system is feasible, with clinically acceptable performance. © RSNA, 2019 Online supplemental material is available for this article. See also the editorial by Auffermann in this issue.
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Affiliation(s)
- Mauro Annarumma
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
| | - Samuel J Withey
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
| | - Robert J Bakewell
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
| | - Emanuele Pesce
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
| | - Vicky Goh
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
| | - Giovanni Montana
- From the Departments of Biomedical Engineering (M.A., R.J.B., E.P., G.M.) and Cancer Imaging (S.J.W., V.G.), School of Biomedical Engineering & Imaging Sciences, King's College London, London, England; Department of Radiology, Guy's & St Thomas' NHS Foundation Trust, London, England (S.J.W., V.G.); and WMG International Digital Laboratory, University of Warwick, Coventry CV32 7AL, England (G.M.)
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Withey SJ, Gariani J, Reddy K, Prezzi D, Kelly-Morland C, Ilyas S, Adam A, Goh V. Is there a role for perfusion imaging in assessing treatment response following ablative therapy of small renal masses-A systematic review. Eur J Radiol Open 2018; 5:102-107. [PMID: 30094296 PMCID: PMC6077124 DOI: 10.1016/j.ejro.2018.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Accepted: 07/02/2018] [Indexed: 12/01/2022] Open
Abstract
Aims Ablation therapies are an innovative nephron-sparing alternative to radical nephrectomy for early stage renal cancers, although determination of treatment success is challenging. We aimed to undertake a systematic review of the literature to determine whether assessment of tumour perfusion may improve response assessment or alter clinical management when compared to standard imaging. Material and Methods Two radiologists performed independent primary literature searches for perfusion imaging in response assessment following ablative therapies (radiofrequency ablation and cryotherapy) focused on renal tumours. Results 5 of 795 articles were eligible, totaling 110 patients. The study designs were heterogeneous with different imaging techniques, perfusion calculations, reference standard and follow-up periods. All studies found lower perfusion following treatment, with a return of ‘high grade’ perfusion in the 7/110 patients with residual or recurrent tumour. One study found perfusion curves were different between successfully ablated regions and residual tumour. Conclusions Studies were limited by small sample size and heterogeneous methodology. No studies have investigated the impact of perfusion imaging on management. This review highlights the current lack of evidence for perfusion imaging in response assessment following renal ablation, however it suggests that there may be a future role. Further prospective research is required to address this.
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Affiliation(s)
- S J Withey
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.,Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
| | - J Gariani
- Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
| | - K Reddy
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - D Prezzi
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.,Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
| | - C Kelly-Morland
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.,Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
| | - S Ilyas
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - A Adam
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.,Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
| | - V Goh
- Department of Radiology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.,Cancer Imaging, Division of Imaging Sciences and Biomedical Engineering, King's College London, United Kingdom
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12
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Tamimi AN, Withey SJ, Khan SU. Lesser sac herniation: a rare cause of acute abdomen and bowel perforation. BJR Case Rep 2017; 3:20150501. [PMID: 30363323 PMCID: PMC6159291 DOI: 10.1259/bjrcr.20150501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 06/15/2016] [Indexed: 11/05/2022] Open
Abstract
Lesser sac herniation is a rare phenomenon, where the bowel protrudes through the epiploic foramen into the lesser sac. We describe the case of a 55-year-old male who presented with acute abdominal pain and in whose case the subtle findings of lesser sac herniation were missed during CT scan reporting. Re-review of the images after the patient’s condition deteriorated found evidence of herniation, and re-scanning at that point demonstrated progression of the herniation, with bowel obstruction and perforation. The findings of lesser sac herniation complicated by basculetype caecal volvulus were confirmed during laparotomy. The patient underwent right hemicolectomy with primary ileocolic anastomosis.
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Clarke A, Lester KJ, Withey SJ, Butler PEM. A funding model for a psychological service to plastic and reconstructive surgery in UK practice. ACTA ACUST UNITED AC 2005; 58:708-13. [PMID: 15925340 DOI: 10.1016/j.bjps.2005.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2004] [Accepted: 02/07/2005] [Indexed: 11/18/2022]
Abstract
Appearance related distress in both clinical and general populations is associated with the increasing identification of surgery as a solution, leading to referrals for cosmetic surgery and pressure on NHS resources. Cosmetic surgery guidelines are designed to control this growing demand, but lack a sound evidence base. Where exceptions are provided on the basis of psychological need, this may recruit patients inappropriately into a surgical pathway, and creates a demand for psychological assessment which transfers the resource problem from one service to another. The model described below evaluates the impact of a designated psychology service to a plastic surgery unit. Developing an operational framework for delivering cosmetic guidelines, which assesses patients using clearly defined and measurable outcomes, has significantly reduced numbers of patients proceeding to the NHS waiting list and provided a systematic audit process. The associated cost savings have provided a way of funding a psychologist within the plastic surgery service so that psychological assessment becomes routine, alternative methods of treatment are easily available and all patients have access to psychological input as part of the routine standard of care.
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Affiliation(s)
- A Clarke
- Department of Plastic and Reconstructive Surgery, Royal Free Hospital, Pond St, London NW3 2QG, UK.
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14
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Abstract
Neurofibromatosis is a relatively common inherited disease of the nervous system, with a frequency of almost 1 in 3000. It is associated with a wide range of vascular abnormalities. A 62-year-old man with neurofibromatosis presented to us with a sacral haematoma. This was due to spontaneous rupture of a pre-existing neurofibromata. Upon admission the patient was in hypovolaemic shock and required aggressive resuscitation prior to surgery. Haemorrhage following trauma or spontaneous rupture is an uncommon complication of neurofibromatosis. The management is discussed with emphasis on the cause and control of bleeding from these lesions.
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Affiliation(s)
- N White
- Department of Plastic and Reconstructive Surgery, Royal Free Hospital, Pond Street, Hampstead, London NW3 2QG, UK.
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15
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Abstract
A new technique of syndactyly release is described. The technique differs from the standard methods in that more digital flaps are used, and these are longer and are not defatted. A single stitch is applied to secure the tip of the flap and the defects between the flaps are not closed or grafted, hence the term "open" technique. Eight patients had 12 webs released using this operation. We compare this technique with 12 patients who had a total of 19 webs released using the standard technique. Patients were assessed for six parameters of operative success.
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Affiliation(s)
- S J Withey
- St Andrews Centre for Plastic Surgery and Burns, Broomfield Hospital, Chelmsford, Essex, UK
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17
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Abstract
Toxic shock syndrome is associated with burn injuries in children and is a cause of significant morbidity in this group. Despite multiple cases of toxic shock syndrome in adults being reported since its original description it has not been reported in adult burn patients. We report a case of toxic shock syndrome in an adult following 25% flame burns.
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Affiliation(s)
- S J Withey
- St Andrew's Centre for Plastic Surgery and Burns, Broomfield Hospital, Chelmsford, Essex, UK
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Millar DS, Withey SJ, Tizard ML, Ford JG, Hermon-Taylor J. Solid-phase hybridization capture of low-abundance target DNA sequences: application to the polymerase chain reaction detection of Mycobacterium paratuberculosis and Mycobacterium avium subsp. silvaticum. Anal Biochem 1995; 226:325-30. [PMID: 7793635 DOI: 10.1006/abio.1995.1232] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Polymerase chain reaction (PCR) has been widely applied to the detection of microorganisms. Overall sensitivity of PCR tests may be substantially reduced due to a large excess of nontarget DNA and inhibitory substances in the sample. We used a 5'-biotinylated 513-bp probe from the 3' region of the IS 900 element specific for Mycobacterium paratuberculosis (Mptb) to capture target Mptb DNA from crude sample DNA extracts. Captured target DNA was separated using streptavidin-coated magnetic particles (Dynal). Since the IS 900 element shares homology over this region with IS 902 in Mycobacterium avium subsp. silvaticum (Mavs), target DNA from this other pathogen was also retained. Highly specific PCR for the detection of either organism directed to the 5' regions of IS 900 or IS 902 was then performed directly on the solid phase. Hybridization capture of target DNA using sequence adjacent to the desired specific PCR site applied to Mptb increased overall sensitivity of detection in tissue and fecal extracts 10- to 100-fold. False positives due to contamination artifact were substantially excluded since the capture probe did not retain amplicons from the detection PCR. Development of the method to involve covalent 5' immobilization of capture probes on heat-resistant polymers should, in the future, provide a simple system with broad potential applications.
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Affiliation(s)
- D S Millar
- Department of Surgery, St. Georges Hospital Medical School, London, United Kingdom
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