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Artificial Intelligence in Lymphoma Imaging: Incorporating Longitudinal Awareness
Artificial Intelligence in Lymphoma Imaging: Incorporating Longitudinal Awareness
Artificial Intelligence in Lymphoma Imaging: Incorporating Longitudinal Awareness

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104654
ISBN  
9798280770447
DDC  
616
저자명  
Tie, Xin.
서명/저자  
Artificial Intelligence in Lymphoma Imaging: Incorporating Longitudinal Awareness
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
143 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Bradshaw, Tyler J.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약Hodgkin lymphoma is the most commonly diagnosed cancer in adolescents. Over the past decades, significant advances in combined modality therapy, risk stratification, and response-adapted therapy have dramatically improved patient outcomes. In pediatric populations, five-year overall survival exceeds 90%, with even higher rates observed in patients at the early stage of the disease. As a result, the therapeutic focus has shifted from maximizing cure to minimizing late effects from treatment-related toxicities.Effective lymphoma management relies on integrating clinical and imaging data across multiple time points to guide treatment strategies. In practice, this involves complex and time-intensive analysis, such as comparing baseline and interim 18F-fluorodeoxyglucose (18F-FDG) PET/CT scans to assess therapeutic response. Despite the availability of rich longitudinal data, most existing artificial intelligence (AI) algorithms are designed to analyze single-time-point images, overlooking the temporal evolution of the disease. To address this gap, this dissertation systematically investigates the integration of longitudinal awareness into AI models for image-guided lymphoma management. Specifically, it explores how leveraging imaging data across different phases of treatment can improve disease quantification, prognostic modeling, and radiation treatment planning.In the first study, we developed a longitudinally aware segmentation network (LAS-Net) for automatic quantification of serial PET/CT images in high-risk pediatric Hodgkin lymphoma. The algorithm utilized longitudinal cross-attention to jointly analyze baseline and interim PET scans. The model was trained and evaluated on a retrospective dataset of 200 patients from the Children's Oncology Group AHOD1331 clinical trial. Results demonstrated that LAS-Net achieved significant improvements in residual lesion detection on interim PET compared to other methods, without sacrificing segmentation accuracy on baseline PET. In PET quantification, LAS-Net's measurements of several key baseline and interim PET metrics (e.g., total metabolic tumor volume or TMTV, and percentage difference between baseline and interim maximum standardized uptake value or ∆SUVmax) were strongly correlated with physician measurements. These results highlight the potential of LAS-Net to deliver rapid and consistent assessment of PET tumor burden and response.In the second study, we evaluated outcome prediction for high-risk pediatric Hodgkin lymphoma using imaging features derived from both baseline and interim PET scans. LAS-Net was applied to the remaining unlabeled cases in the AHOD1331 trial to generate tumor segmentations, which were then reviewed and corrected by nuclear medicine physicians to ensure accuracy. This process yielded a large, multi-institutional cohort of 559 pediatric patients. We assessed the prognostic value of common clinical risk factors, conventional PET metrics, and radiomics features. Among these, the model incorporating conventional PET metrics, particularly baseline TMTV and interim qPET (peak lesion SUV divided by mean liver SUV), demonstrated the highest prognostic performance, significantly outperforming models based solely on clinical variables. Furthermore, we evaluated the prognostic utility of PET metrics extracted from deep learning (DL)-based segmentations and found that models using DL-derived features could achieve performance comparable to those built on physician-derived features. This study represents one of the most comprehensive survival analyses conducted in pediatric Hodgkin lymphoma, offering valuable insights for enhancing risk stratification.The third study focused on automatic delineation of clinical target volume (CTV) in involved-site radiation therapy (ISRT) for Hodgkin lymphoma. ISRT targets initially involved lymph nodes and tissues while accounting for anatomical changes following chemotherapy. In clinical practice, radiation oncologists rely on FDG PET imaging, especially baseline PET/CT, for CTV delineation. In this work, we investigated various DL architectures and evaluated the impact of incorporating baseline and interim PET images alongside the planning CT. Comparative analysis showed that models incorporating PET/CT images significantly improved CTV segmentation accuracy compared to models based on planning CT alone. Evaluation against inter-observer variability and independent clinical review supported that DL-generated contours were of comparable quality to those manually created by radiation oncologists. Importantly, over half of the DL-generated CTVs were considered clinically acceptable with minor or no changes needed, highlighting the model's real-world potential to facilitate ISRT planning by providing high-quality initial contours for radiation oncologists to review and refine.The final study broadened the scope of this dissertation by applying the longitudinally aware segmentation framework to MR-guided adaptive radiation therapy in head and neck cancer. Specifically, we focused on improving the segmentation accuracy of mid-treatment gross tumor volume (GTV) on MR images by incorporating pre-treatment GTV information. Consistent with earlier findings, the integration of prior imaging significantly enhanced model performance, achieving segmentation accuracy comparable to the inter-observer variability among expert radiation oncologists. These results demonstrate the strong potential of our model to streamline clinical workflows in radiation oncology and, more importantly, validate the broader applicability of the proposed framework beyond lymphoma.Collectively, the studies presented in this dissertation highlight the importance of integrating longitudinal imaging data into AI model development. These findings lay the foundation for future research and provide a compelling case for the prospective clinical integration and evaluation of longitudinally aware AI tools to advance personalized cancer care.
일반주제명  
Medical imaging
일반주제명  
Physics
키워드  
Deep learning
키워드  
Lymphoma
키워드  
Nuclear medicine
키워드  
Outcome analysis
키워드  
Radiation therapy
키워드  
Segmentation
기타저자  
The University of Wisconsin - Madison Medical Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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■1001  ▼aTie,  Xin.
■24510▼aArtificial  Intelligence  in  Lymphoma  Imaging:  Incorporating  Longitudinal  Awareness
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a143  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Bradshaw,  Tyler  J.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aHodgkin  lymphoma  is  the  most  commonly  diagnosed  cancer  in  adolescents.  Over  the  past  decades,  significant  advances  in  combined  modality  therapy,  risk  stratification,  and  response-adapted  therapy  have  dramatically  improved  patient  outcomes.  In  pediatric  populations,  five-year  overall  survival  exceeds  90%,  with  even  higher  rates  observed  in  patients  at  the  early  stage  of  the  disease.  As  a  result,  the  therapeutic  focus  has  shifted  from  maximizing  cure  to  minimizing  late  effects  from  treatment-related  toxicities.Effective  lymphoma  management  relies  on  integrating  clinical  and  imaging  data  across  multiple  time  points  to  guide  treatment  strategies.  In  practice,  this  involves  complex  and  time-intensive  analysis,  such  as  comparing  baseline  and  interim  18F-fluorodeoxyglucose  (18F-FDG)  PET/CT  scans  to  assess  therapeutic  response.  Despite  the  availability  of  rich  longitudinal  data,  most  existing  artificial  intelligence  (AI)  algorithms  are  designed  to  analyze  single-time-point  images,  overlooking  the  temporal  evolution  of  the  disease.  To  address  this  gap,  this  dissertation  systematically  investigates  the  integration  of  longitudinal  awareness  into  AI  models  for  image-guided  lymphoma  management.  Specifically,  it  explores  how  leveraging  imaging  data  across  different  phases  of  treatment  can  improve  disease  quantification,  prognostic  modeling,  and  radiation  treatment  planning.In  the  first  study,  we  developed  a  longitudinally  aware  segmentation  network  (LAS-Net)  for  automatic  quantification  of  serial  PET/CT  images  in  high-risk  pediatric  Hodgkin  lymphoma.  The  algorithm  utilized  longitudinal  cross-attention  to  jointly  analyze  baseline  and  interim  PET  scans.  The  model  was  trained  and  evaluated  on  a  retrospective  dataset  of  200  patients  from  the  Children's  Oncology  Group  AHOD1331  clinical  trial.  Results  demonstrated  that  LAS-Net  achieved  significant  improvements  in  residual  lesion  detection  on  interim  PET  compared  to  other  methods,  without  sacrificing  segmentation  accuracy  on  baseline  PET.  In  PET  quantification,  LAS-Net's  measurements  of  several  key  baseline  and  interim  PET  metrics  (e.g.,  total  metabolic  tumor  volume  or  TMTV,  and  percentage  difference  between  baseline  and  interim  maximum  standardized  uptake  value  or  ∆SUVmax)  were  strongly  correlated  with  physician  measurements.  These  results  highlight  the  potential  of  LAS-Net  to  deliver  rapid  and  consistent  assessment  of  PET  tumor  burden  and  response.In  the  second  study,  we  evaluated  outcome  prediction  for  high-risk  pediatric  Hodgkin  lymphoma  using  imaging  features  derived  from  both  baseline  and  interim  PET  scans.  LAS-Net  was  applied  to  the  remaining  unlabeled  cases  in  the  AHOD1331  trial  to  generate  tumor  segmentations,  which  were  then  reviewed  and  corrected  by  nuclear  medicine  physicians  to  ensure  accuracy.  This  process  yielded  a  large,  multi-institutional  cohort  of  559  pediatric  patients.  We  assessed  the  prognostic  value  of  common  clinical  risk  factors,  conventional  PET  metrics,  and  radiomics  features.  Among  these,  the  model  incorporating  conventional  PET  metrics,  particularly  baseline  TMTV  and  interim  qPET  (peak  lesion  SUV  divided  by  mean  liver  SUV),  demonstrated  the  highest  prognostic  performance,  significantly  outperforming  models  based  solely  on  clinical  variables.  Furthermore,  we  evaluated  the  prognostic  utility  of  PET  metrics  extracted  from  deep  learning  (DL)-based  segmentations  and  found  that  models  using  DL-derived  features  could  achieve  performance  comparable  to  those  built  on  physician-derived  features.  This  study  represents  one  of  the  most  comprehensive  survival  analyses  conducted  in  pediatric  Hodgkin  lymphoma,  offering  valuable  insights  for  enhancing  risk  stratification.The  third  study  focused  on  automatic  delineation  of  clinical  target  volume  (CTV)  in  involved-site  radiation  therapy  (ISRT)  for  Hodgkin  lymphoma.  ISRT  targets  initially  involved  lymph  nodes  and  tissues  while  accounting  for  anatomical  changes  following  chemotherapy.  In  clinical  practice,  radiation  oncologists  rely  on  FDG  PET  imaging,  especially  baseline  PET/CT,  for  CTV  delineation.  In  this  work,  we  investigated  various  DL  architectures  and  evaluated  the  impact  of  incorporating  baseline  and  interim  PET  images  alongside  the  planning  CT.  Comparative  analysis  showed  that  models  incorporating  PET/CT  images  significantly  improved  CTV  segmentation  accuracy  compared  to  models  based  on  planning  CT  alone.  Evaluation  against  inter-observer  variability  and  independent  clinical  review  supported  that  DL-generated  contours  were  of  comparable  quality  to  those  manually  created  by  radiation  oncologists.  Importantly,  over  half  of  the  DL-generated  CTVs  were  considered  clinically  acceptable  with  minor  or  no  changes  needed, highlighting  the  model's  real-world  potential  to  facilitate  ISRT  planning  by  providing  high-quality  initial  contours  for  radiation  oncologists  to  review  and  refine.The  final  study  broadened  the  scope  of  this  dissertation  by  applying  the  longitudinally  aware  segmentation  framework  to  MR-guided  adaptive  radiation  therapy  in  head  and  neck  cancer.  Specifically,  we  focused  on  improving  the  segmentation  accuracy  of  mid-treatment  gross  tumor  volume  (GTV)  on  MR  images  by  incorporating  pre-treatment  GTV  information.  Consistent  with  earlier  findings,  the  integration  of  prior  imaging  significantly  enhanced  model  performance,  achieving  segmentation  accuracy  comparable  to  the  inter-observer  variability  among  expert  radiation  oncologists.  These  results  demonstrate  the  strong  potential  of  our  model  to  streamline  clinical  workflows  in  radiation  oncology  and,  more  importantly,  validate  the  broader  applicability  of  the  proposed  framework  beyond  lymphoma.Collectively,  the  studies  presented  in  this  dissertation  highlight  the  importance  of  integrating  longitudinal  imaging  data  into  AI  model  development.  These  findings  lay  the  foundation  for  future  research  and  provide  a  compelling  case  for  the  prospective  clinical  integration  and  evaluation  of  longitudinally  aware  AI  tools  to  advance  personalized  cancer  care.
■590    ▼aSchool  code:  0262.
■650  4▼aMedical  imaging
■650  4▼aPhysics
■653    ▼aDeep  learning
■653    ▼aLymphoma
■653    ▼aNuclear  medicine
■653    ▼aOutcome  analysis
■653    ▼aRadiation  therapy
■653    ▼aSegmentation
■690    ▼a0574
■690    ▼a0800
■690    ▼a0605
■71020▼aThe  University  of  Wisconsin  -  Madison▼bMedical  Physics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358390▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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