<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">medvis</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинская визуализация</journal-title><trans-title-group xml:lang="en"><trans-title>Medical Visualization</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1607-0763</issn><issn pub-type="epub">2408-9516</issn><publisher><publisher-name>RDS-Media Ltd.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24835/10.24835/1607-0763-1068</article-id><article-id custom-type="elpub" pub-id-type="custom">medvis-1068</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>БРЮШНАЯ ПОЛОСТЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ABDOMEN</subject></subj-group></article-categories><title-group><article-title>Дифференциальная диагностика псевдотуморозного панкреатита и протоковой аденокарциномы поджелудочной железы: характеристики КТ с контрастированием и текстурного анализа</article-title><trans-title-group xml:lang="en"><trans-title>Texture analysis of contrast enhancement СT in the differential diagnosis of mass-forming pancreatitis and pancreatic ductal adenocarcinoma</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9782-7335</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тихонова</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Tikhonova</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тихонова Валерия Сергеевна – аспирант отделения рентгенологии и магнитно-резонансных исследований</p><p>117997 Москва, ул. Большая Серпуховская, д. 27</p><p>Тел.: +7-929-938-18-49</p></bio><bio xml:lang="en"><p>Valeriya S. Tikhonova – graduate student of radiology department </p><p>27, Bolshaya Serpukhovskaya str., 117997 Moscow</p><p>Phone: +7-929-938-18-49</p></bio><email xlink:type="simple">vdovenkobc28@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0781-9898</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Груздев</surname><given-names>И. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Gruzdev</surname><given-names>I. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Груздев Иван Сергеевич – аспирант отделения рентгенологии и магнитно-резонансных исследований </p><p>117997 Москва, ул. Большая Серпуховская, д. 27</p></bio><bio xml:lang="en"><p>Ivan S. Gruzdev – graduate student of radiology department </p><p>27, Bolshaya Serpukhovskaya str., 117997 Moscow</p></bio><email xlink:type="simple">gruzdev_van@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7070-3391</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кондратьев</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kondratyev</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кондратьев Евгений Валерьевич – канд. мед. наук, старший научный сотрудник отделения рентгенологии и магнитно-резонансных исследований</p><p>117997 Москва, ул. Большая Серпуховская, д. 27</p></bio><bio xml:lang="en"><p>Evgeny V. Kondratyev – Cand. of Sсi. (Med.), senior researcher of radiology department </p><p>27, Bolshaya Serpukhovskaya str., 117997 Moscow</p></bio><email xlink:type="simple">evgenykondratiev@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3825-0868</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Михайлюк</surname><given-names>К. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Mikhaylyuk</surname><given-names>K. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Михайлюк Ксения Андреевна – ординатор отделения рентгенологии и магнитно-резонансных исследований </p><p>117997 Москва, ул. Большая Серпуховская, д. 27</p></bio><bio xml:lang="en"><p>Kseniya A. Mikhaylyuk – resident of radiology department </p><p>27, Bolshaya Serpukhovskaya str., 117997 Moscow</p></bio><email xlink:type="simple">kseniya.mihaylyuk@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9357-0998</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кармазановский</surname><given-names>Г. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kаrmаzаnovsky</surname><given-names>G. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кармазановский Григорий Григорьевич – член-корр. РАН, доктор мед. наук, профессор, заведующий отделом лучевых методов диагностики и лечения; профессор кафедры лучевой диагностики и терапии медико-биологического факультета</p><p>117997 Москва, ул. Большая Серпуховская, д. 27</p><p>117997 Москва, ул. Островитянова, д. 1</p></bio><bio xml:lang="en"><p>Grigory G. Kаrmаzаnovsky – Corresponding Member of the Russiаn Асаdemy of Sсienсes, Doсt. of Sсi. (Med.), Professor, Heаd of rаdiology depаrtment; Professor of radiology department</p><p>27, Bolshaya Serpukhovskaya str., 117997 Moscow</p><p>1, Ostrovitianova str., 117997 Moscow</p></bio><email xlink:type="simple">karmazanovsky@ixv.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ “Национальный медицинский исследовательский центр хирургии имени А.В. Вишневского” Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vishnevsky National Medical Research Center of Surgery of the Ministry of Health of the Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБУ “Национальный медицинский исследовательский центр хирургии им. А.В. Вишневского” Минздрава России; ФГБОУ ВО “РНИМУ им. Н.И. Пирогова” Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vishnevsky National Medical Research Center of Surgery of the Ministry of Health of the Russian Federation; Russian National Research Medical University named after N. I. Pirogov</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>05</day><month>03</month><year>2022</year></pub-date><volume>26</volume><issue>1</issue><fpage>140</fpage><lpage>154</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тихонова В.С., Груздев И.С., Кондратьев Е.В., Михайлюк К.А., Кармазановский Г.Г., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Тихонова В.С., Груздев И.С., Кондратьев Е.В., Михайлюк К.А., Кармазановский Г.Г.</copyright-holder><copyright-holder xml:lang="en">Tikhonova V.S., Gruzdev I.S., Kondratyev E.V., Mikhaylyuk K.A., Kаrmаzаnovsky G.G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://medvis.rdsmedia.ru/jour/article/view/1068">https://medvis.rdsmedia.ru/jour/article/view/1068</self-uri><abstract><p>Цель исследования: повышение эффективности КТ в дифференциальной диагностике протоковой аденокарциномы поджелудочной железы (ПАК ПЖ) и псевдотуморозного хронического панкреатита (ПХП); составление диагностической модели на основе извлеченных текстурных показателей в комбинации с характеристиками контрастирования.Материал и методы. В исследование было включено 45 пациентов с гистологически подтвержденной неметастатической местнораспространенной ПАК ПЖ и 13 пациентов с ПХП, которым было выполнено КТ-исследование с внутривенным контрастированием. Для каждой группы рассчитаны отношение плотностей сохранной ткани поджелудочной железы и образований, относительный коэффициент накопления образований (RTE) во все контрастные фазы КТ-сканирования, 94 текстурных показателя для каждой фазы исследования и проведено их сравнение. Отбор предикторов в логистическую модель осуществлялся в 2 этапа: 1) отбор предикторов на основе однофакторных логистических моделей, критерием отбора служило padj &lt; 0,2; 2) отбор предикторов с помощью “лассо”-регрессии после стандартизации переменных. Отобранные предикторы включались в логистическую регрессионную модель без взаимодействий.Результаты. Статистически значимо различались 14, 17, 4 из 94 для нативной, артериальной, венозной фаз исследования соответственно (p &lt; 0,05). После отбора в итоговую диагностическую модель были включены показатели CONVENTIONAL HUQ2 и DISCRETIZED HUQ1 для нативной фазы, DISCRETIZED HUQ1 и GLRLM RLNU для артериальной фазы, DISCRETIZED Skewness для венозной фазы, RTE для отсроченной фазы КТ-исследования. На их основании построена диагностическая модель, показавшая точность 81% в диагностике ПХП.Заключение. Разработанная нами диагностическая модель, включающая текстурные показатели и характеристики контрастирования, позволяет предоперационно отличать ПХП и ПАК ПЖ и повысить точность предоперационной диагностики.</p></abstract><trans-abstract xml:lang="en"><p>Purpose. Improving the efficiency of CT in the differential diagnosis of mass-forming pancreatitis (MFP) and pancreatic ductal adenocarcinoma (PDAC) making a diagnostic model based using a combination of texture features and contrast enhancement features.Methods and materials. 45 patients with histologically confirmed non-metastatic locally advanced PDAC and 13 patients with MFP where underwent CT examination with contrast enhancement. For each group, the ratio of the densities of intact pancreatic tissue and tumors, the relative tumor enhancement ratio (RTE) in all enhanced phases of CT, 94 texture features for each phase of the study were calculated and compared. The selection of predictors in the logistic model was carried out in 2 stages: 1) selection of predictors based on one-factor logistic models, the selection criterion was padj &lt;0.2; 2) selection of predictors using LASSO-regression after standardization of variables. The selected predictors were included in a logistic regression model without interactions.Results. There were statistically significant differences in 14, 17, 4 out of 94 for the unenhanced, arterial, and venous phases of the study, respectively (p &lt; 0.05). After selection, the final diagnostic model included the texture features CONVENTIONAL HUQ2 and DISCRETIZED HUQ1 for the unenhanced phase, DISCRETIZED HUQ1 and GLRLM RLNU for the arterial phase, DISCRETIZED Skewness for the venous phase, RTE for the delayed CT phase. The diagnostic model was built showed an accuracy of 81% in the diagnosis of MFP.Conclusion. We have developed a diagnostic model, including textural parameters and contrast enhancement features, which allows preoperatively distinguish MFP and PDAC, the developed model will increase the accuracy of preoperative diagnosis.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>протоковая аденокарцинома поджелудочной железы</kwd><kwd>текстурный анализ</kwd><kwd>компьютерная томография</kwd><kwd>псевдотуморозный панкреатит</kwd></kwd-group><kwd-group xml:lang="en"><kwd>ductal adenocarcinoma of the pancreas</kwd><kwd>radiomics features</kwd><kwd>computed tomography</kwd><kwd>mass-forming&#13;
pancreatitis</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Настоящее исследование финансировалось Российским фондом фундаментальных исследований по исследовательскому проекту № 20-315-90092. Источник финансирования не участвовал в разработке исследования; в сборе, анализе и интерпретации данных; при написании отчета и в решении о подаче статьи для публикации.</funding-statement><funding-statement xml:lang="en">The reported study was funded by Russian Foundation for Basic Research according to the research project № 20-315-90092. The funding source had not any involvement in study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Sung H., Ferlay J., Siegel R.L. et al. Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries. CA Cancer J. Clin. 2021; 71 (3): 209–249. https://doi.org/10.3322/caac.21660</mixed-citation><mixed-citation xml:lang="en">Sung H., Ferlay J., Siegel R.L. et al. Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries. CA Cancer J. Clin. 2021; 71 (3): 209–249. https://doi.org/10.3322/caac.21660</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Sarantis P., Koustas E., Papadimitropoulou A. et al. Pancreatic ductal adenocarcinoma: Treatment hurdles, tumor microenvironment and immunotherapy. Wld J. Gastrointest. Oncol. 2020; 12 (2): 173–181. https://doi.org/10.4251/wjgo.v12.i2.173</mixed-citation><mixed-citation xml:lang="en">Sarantis P., Koustas E., Papadimitropoulou A. et al. Pancreatic ductal adenocarcinoma: Treatment hurdles, tumor microenvironment and immunotherapy. Wld J. Gastrointest. Oncol. 2020; 12 (2): 173–181. https://doi.org/10.4251/wjgo.v12.i2.173</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Wolske K.M., Ponnatapura J., Kolokythas O. et al. Chronic Pancreatitis or Pancreatic Tumor? A Problem-solving Approach. Radiographics. 2019; 39 (7): 1965–1982. https://doi.org/10.1148/rg.2019190011</mixed-citation><mixed-citation xml:lang="en">Wolske K.M., Ponnatapura J., Kolokythas O. et al. Chronic Pancreatitis or Pancreatic Tumor? A Problem-solving Approach. Radiographics. 2019; 39 (7): 1965–1982. https://doi.org/10.1148/rg.2019190011</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Narkhede R.A., Desai G.S., Prasad P.P., Wagle P.K. Diagnosis and Management of Pancreatic Adenocarcinoma in the Background of Chronic Pancreatitis: Core Issues. Dig. Dis. 2019; 37 (4): 315–324. https://doi.org/10.1159/000496507</mixed-citation><mixed-citation xml:lang="en">Narkhede R.A., Desai G.S., Prasad P.P., Wagle P.K. Diagnosis and Management of Pancreatic Adenocarcinoma in the Background of Chronic Pancreatitis: Core Issues. Dig. Dis. 2019; 37 (4): 315–324. https://doi.org/10.1159/000496507</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Meng F., Guo Y., Li M. et al. Radiomics nomogram: A noninvasive tool for preoperative evaluation of the invasiveness of pulmonary adenocarcinomas manifesting as ground-glass nodules. Transl. Oncol. 2021; 14 (1): 100936. https://doi.org/10.1016/j.tranon.2020.100936</mixed-citation><mixed-citation xml:lang="en">Meng F., Guo Y., Li M. et al. Radiomics nomogram: A noninvasive tool for preoperative evaluation of the invasiveness of pulmonary adenocarcinomas manifesting as ground-glass nodules. Transl. Oncol. 2021; 14 (1): 100936. https://doi.org/10.1016/j.tranon.2020.100936</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Gillies R.J., Kinahan P.E., Hricak H. Radiomics: Images Are More than Pictures, They Are Data. Radiology. 2016; 278 (2): 563–577. https://doi.org/10.1148/radiol.2015151169</mixed-citation><mixed-citation xml:lang="en">Gillies R.J., Kinahan P.E., Hricak H. Radiomics: Images Are More than Pictures, They Are Data. Radiology. 2016; 278 (2): 563–577. https://doi.org/10.1148/radiol.2015151169</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Park S., Chu L.C., Hruban R.H. et al. Differentiating autoimmune pancreatitis from pancreatic ductal adenocarcinoma with CT radiomics features. Diagn. Interv. Imaging. 2020; 101 (9): 555–564. https://doi.org/10.1016/j.diii.2020.03.002</mixed-citation><mixed-citation xml:lang="en">Park S., Chu L.C., Hruban R.H. et al. Differentiating autoimmune pancreatitis from pancreatic ductal adenocarcinoma with CT radiomics features. Diagn. Interv. Imaging. 2020; 101 (9): 555–564. https://doi.org/10.1016/j.diii.2020.03.002</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Zhang Y., Cheng C., Liu Z. et al. Radiomics analysis for the differentiation of autoimmune pancreatitis and pancreatic ductal adenocarcinoma in 18F-FDG PET/CT. Med. Phys. 2019; 46: 4520–4530.</mixed-citation><mixed-citation xml:lang="en">Zhang Y., Cheng C., Liu Z. et al. Radiomics analysis for the differentiation of autoimmune pancreatitis and pancreatic ductal adenocarcinoma in 18F-FDG PET/CT. Med. Phys. 2019; 46: 4520–4530.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Zhang Y., Cheng C., Liu Z. et al. Radiomics analysis for the differentiation of autoimmune pancreatitis and pancreatic ductal adenocarcinoma in 18F-FDG PET/CT. Med. Phys. 2019; 46 (10): 4520–4530. https://doi.org/10.1002/mp.13733</mixed-citation><mixed-citation xml:lang="en">Zhang Y., Cheng C., Liu Z. et al. Radiomics analysis for the differentiation of autoimmune pancreatitis and pancreatic ductal adenocarcinoma in 18F-FDG PET/CT. Med. Phys. 2019; 46 (10): 4520–4530. https://doi.org/10.1002/mp.13733</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Dai W., Mo S., Han L. et al. Prognostic and predictive value of radiomics signatures in stage I-III colon cancer. Clin Transl Med. 2020; 10 (1): 288–293. https://doi.org/10.1002/ctm2.31</mixed-citation><mixed-citation xml:lang="en">Dai W., Mo S., Han L. et al. Prognostic and predictive value of radiomics signatures in stage I-III colon cancer. Clin Transl Med. 2020; 10 (1): 288–293. https://doi.org/10.1002/ctm2.31</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Ren S., Zhao R., Zhang J. et al. Diagnostic accuracy of unenhanced CT texture analysis to differentiate massforming pancreatitis from pancreatic ductal adenocarcinoma. Abdominal. Radiol. (NY). 2020; 45 (5): 1524– 1533. https://doi.org/10.1007/s00261-020-02506-6</mixed-citation><mixed-citation xml:lang="en">Ren S., Zhao R., Zhang J. et al. Diagnostic accuracy of unenhanced CT texture analysis to differentiate massforming pancreatitis from pancreatic ductal adenocarcinoma. Abdominal. Radiol. (NY). 2020; 45 (5): 1524– 1533. https://doi.org/10.1007/s00261-020-02506-6</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Ren S., Zhang J., Chen J. et al. Evaluation of Texture Analysis for the Differential Diagnosis of Mass-Forming Pancreatitis From Pancreatic Ductal Adenocarcinoma on Contrast-Enhanced CT Images. Front. Oncol. 2019; 9: 1171. Published 2019 Nov 5. https://doi.org/10.3389/fonc.2019.01171</mixed-citation><mixed-citation xml:lang="en">Ren S., Zhang J., Chen J. et al. Evaluation of Texture Analysis for the Differential Diagnosis of Mass-Forming Pancreatitis From Pancreatic Ductal Adenocarcinoma on Contrast-Enhanced CT Images. Front. Oncol. 2019; 9: 1171. Published 2019 Nov 5. https://doi.org/10.3389/fonc.2019.01171</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Washington M.K., Berlin J., Branton P.A. et al. Protocol for the examination of specimens from patients with carcinoma of the distal extrahepatic bile ducts. Arch. Pathol. Lab. Med. 2010; 134 (4): e8–e13. https://doi.org/10.5858/134.4.e8</mixed-citation><mixed-citation xml:lang="en">Washington M.K., Berlin J., Branton P.A. et al. Protocol for the examination of specimens from patients with carcinoma of the distal extrahepatic bile ducts. Arch. Pathol. Lab. Med. 2010; 134 (4): e8–e13. https://doi.org/10.5858/134.4.e8</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Nioche C., Orlhac F., Boughdad S. et al. LIFEx: A Freeware for Radiomic Feature Calculation in Multimodality Imaging to Accelerate Advances in the Characterization of Tumor Heterogeneity. Cancer Res. 2018; 78 (16): 4786–4789. https://doi.org/10.1158/0008-5472.CAN-18-0125</mixed-citation><mixed-citation xml:lang="en">Nioche C., Orlhac F., Boughdad S. et al. LIFEx: A Freeware for Radiomic Feature Calculation in Multimodality Imaging to Accelerate Advances in the Characterization of Tumor Heterogeneity. Cancer Res. 2018; 78 (16): 4786–4789. https://doi.org/10.1158/0008-5472.CAN-18-0125</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Тихонова В.С., Кармазановский Г.Г., Кондратьев Е.В., Груздев И.С., Глотов А.В. Влияние параметров низкодозового протокола сканирования на результаты текстурного анализа протоковой аденокарциномы поджелудочной железы. Анналы хирургической гепатологии. 2021; 26 (1): 25–33. https://doi.org/10.16931/1995-5464.2021125-33. Tikhonova V.S., Karmazanovsky G.G., Kondratyev E.V., Gruzdev I.S., Glotov A.V. Influence of the low-dose CEMDCT scanning protocol parameters on the results of pancreatic ductal adenocarcinoma radiomic analysis. Annaly khirurgicheskoy gepatologii = Annals of HPB surgery. 2021; 26 (1): 25–33. https://doi.org/10.16931/1995-5464.2021125-33 (In Russian)</mixed-citation><mixed-citation xml:lang="en">Тихонова В.С., Кармазановский Г.Г., Кондратьев Е.В., Груздев И.С., Глотов А.В. Влияние параметров низкодозового протокола сканирования на результаты текстурного анализа протоковой аденокарциномы поджелудочной железы. Анналы хирургической гепатологии. 2021; 26 (1): 25–33. https://doi.org/10.16931/1995-5464.2021125-33. Tikhonova V.S., Karmazanovsky G.G., Kondratyev E.V., Gruzdev I.S., Glotov A.V. Influence of the low-dose CEMDCT scanning protocol parameters on the results of pancreatic ductal adenocarcinoma radiomic analysis. Annaly khirurgicheskoy gepatologii = Annals of HPB surgery. 2021; 26 (1): 25–33. https://doi.org/10.16931/1995-5464.2021125-33 (In Russian)</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Steyerberg E.W. Coding of categorical and continuous predictors. Clinical prediction models. Springer, Cham, 2019. 175–190. https://doi.org/10.1007/978-3-030-16399-0_9</mixed-citation><mixed-citation xml:lang="en">Steyerberg E.W. Coding of categorical and continuous predictors. Clinical prediction models. Springer, Cham, 2019. 175–190. https://doi.org/10.1007/978-3-030-16399-0_9</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Gareth J., Daniela W., Trevor H., Robert T. An introduction to statistical learning: with applications in R. Spinger, 2013. ISBN: 978-1-4614-7138-7. https://doi.org/10.18637/jss.v070.b02</mixed-citation><mixed-citation xml:lang="en">Gareth J., Daniela W., Trevor H., Robert T. An introduction to statistical learning: with applications in R. Spinger, 2013. ISBN: 978-1-4614-7138-7. https://doi.org/10.18637/jss.v070.b02</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Harrell F.E. Regression Modeling Strategies: With Applications to Linear Models, Logistic and Ordinal Regression, and Survival Analysis. 2nd ed. 2015 ed. Cham. Heidelberg; New York: Springer, 2015: 209–212.</mixed-citation><mixed-citation xml:lang="en">Harrell F.E. Regression Modeling Strategies: With Applications to Linear Models, Logistic and Ordinal Regression, and Survival Analysis. 2nd ed. 2015 ed. Cham. Heidelberg; New York: Springer, 2015: 209–212.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Siddiqi A.J., Miller F. Chronic pancreatitis: ultrasound, computed tomography, and magnetic resonance imaging features. Semin. Ultrasound CT MR. 2007; 28 (5): 384–394. https://doi.org/10.1053/j.sult.2007.06.003</mixed-citation><mixed-citation xml:lang="en">Siddiqi A.J., Miller F. Chronic pancreatitis: ultrasound, computed tomography, and magnetic resonance imaging features. Semin. Ultrasound CT MR. 2007; 28 (5): 384–394. https://doi.org/10.1053/j.sult.2007.06.003</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Sahani D.V., Kalva S.P., Farrell J. et al. Autoimmune pancreatitis: imaging features. Radiology. 2004; 233 (2): 345–352. https://doi.org/10.1148/radiol.2332031436</mixed-citation><mixed-citation xml:lang="en">Sahani D.V., Kalva S.P., Farrell J. et al. Autoimmune pancreatitis: imaging features. Radiology. 2004; 233 (2): 345–352. https://doi.org/10.1148/radiol.2332031436</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Ren S., Chen X., Cui W. et al. Differentiation of chronic mass-forming pancreatitis from pancreatic ductal adenocarcinoma using contrast-enhanced computed tomography. Cancer Managm. Res. 2019; 11: 7857–7866. https://doi.org/10.2147/CMAR.S217033</mixed-citation><mixed-citation xml:lang="en">Ren S., Chen X., Cui W. et al. Differentiation of chronic mass-forming pancreatitis from pancreatic ductal adenocarcinoma using contrast-enhanced computed tomography. Cancer Managm. Res. 2019; 11: 7857–7866. https://doi.org/10.2147/CMAR.S217033</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
