Title

Timestep-Synchronized Frequency-Aware Pseudo-3D Diffusion for Structurally Consistent CT Volume Generation

Alternative Title

시간 단계 동기화 주파수 인지형 Pseudo-3D 확산 모델을 이용한 구조적 일관성 기반 CT 볼륨 생성

DGIST Authors

Yeonwoo Seo ; Inkyu Moon

Advisor

문인규

Issued Date

2026

Awarded Date

2026-08-01

Type

Thesis

Description

Diffusion Models,Pseudo-3D Generation,Medical Image Synthesis,Volumetric Consistency

Table Of Contents

Ⅰ. Introduction 1
1.1 Motivation and Problem Definition 1
1.2 Limitations of Existing Methods 1
1.3 Proposed Method and Contributions 2
1.4 Paper Organization 3

Ⅱ. Related Work 3
2.1 Medical Image Generation with Diffusion Models 3
2.2 Diffusion-Based Medical Image Synthesis and Structural Limitations 3
2.3 Existing Approaches for Inter-Slice Consistency 4
2.4 Anatomical Priors and Frequency-Aware Structural Guidance 4

Ⅲ. Preliminary 5
3.1 Denoising Diffusion Probabilistic Models 5
3.2 Timestep Embedding and Conditional Modulation 6
3.3 Frequency Domain Analysis 6
3.4 Coarse-to-Fine Diffusion Characteristics 6

Ⅳ. Method 7
4.1 Overall Framework Overview 7
4.2 Anatomical Template Generation 7
4.3 Pseudo-3D Multi-Conditional Representation 7
4.4 Conditional Diffusion Formulation 8
4.5 Network Architecture 9
4.6 Frequency-Aware Loss 9
4.7 Inference Stage 12

Ⅴ. Experiments 13
5.1 Dataset 13
5.1.1 Virtual Skeleton Database （VSD） 13
5.2 Data Preprocessing 14
5.2.1 Volume Cropping and Slice Selection 14
5.3 Implementation Details 14
5.3.1 Experimental Environment 14
5.3.2 Training Configuration 14
5.4 Evaluation Metrics 14
5.4.1 Segmentation-Based Anatomical Evaluation 15
5.4.2 Image Quality Evaluation 15
5.5 Ablation Study 15
5.5.1 Ablation Study Design 15
5.5.2 Quantitative Ablation Results 16
5.5.3 Qualitative Evaluation 18

Ⅵ. Conclusions 20

References 22

URI

https://scholar.dgist.ac.kr/handle/20.500.11750/60780
http://dgist.dcollection.net/common/orgView/200001014299

DOI

10.22677/THESIS.200001014299

Degree

Master

Department

Department of Robotics and Mechatronics Engineering

Publisher

DGIST

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