cleaning_report.md

Data Cleaning Report

Generated: 2026-02-07 19:13:04 Updated: 2026-02-07 (removed 3 patients with incomplete MRI channels)

1. Dataset Overview

Group	Folder	Patients	Label
Normal	normal/	40	0
Lateral Ventricular Megaly (LVM)	LVM/	39	1
Periventricular Leukomalacia (PVL)	PVL/	40	2
LVM + PVL	LVM_PVL/	38	3

Total patients: 157

2. Data Cleaning Actions

Action	Details
Removed PII	姓名 (patient name), 住院号 (hospital ID)
Column translation	编号→patient_id, 检查描述→exam_description, 检查结果→diagnosis
Added columns	group, group_label (0-3), group_name_en
Format conversion	.xlsx → .csv (UTF-8)
Folder renaming	Chinese → English (see below)
Text cleaning	Removed non-breaking spaces (\xa0), stripped whitespace
Removed incomplete	3 patients missing T2-SAG: 100-21 (LVM), 110-14, 110-52 (LVM_PVL)

Folder Renaming

Original (Chinese)	New (English)
正常 2026-2-6	normal
扩张 2026-2-6	LVM
软化 2026-2-6	PVL
扩张+软化 2026-2-7	LVM_PVL

3. MRI Channel Integrity

Target channels: FLAIR, T1WI, T2-SAG, T2WI

normal (Normal)

• Patients: 40
• Total target-channel DCM files: 2661
• Average DCM per patient (4 channels): 66.5
• All patients have complete target channels

LVM (Lateral Ventricular Megaly (LVM))

• Patients: 39
• Total target-channel DCM files: 2,625
• Average DCM per patient (4 channels): 67.3
• All patients have complete target channels
• Extra channels present (not used): 3D-SWI, ADC, DWI, SWI

PVL (Periventricular Leukomalacia (PVL))

• Patients: 40
• Total target-channel DCM files: 2,662
• Average DCM per patient (4 channels): 66.5
• All patients have complete target channels

LVM_PVL (LVM + PVL)

• Patients: 38
• Total target-channel DCM files: 2,520
• Average DCM per patient (4 channels): 66.3
• All patients have complete target channels
• Extra channels present (not used): ADC, DWI, SWI, T1+C

4. Output File Structure

feng_dataset/
├── clinical_data_all.csv          # Combined dataset (all groups)
├── clean_data.py                  # This cleaning script
├── cleaning_report.md             # This report
├── normal/                        # Normal controls
│   ├── clinical_data.csv
│   └── 001-441/                   # Patient folders
│       ├── FLAIR/  (*.DCM)
│       ├── T1WI/   (*.DCM)
│       ├── T2-SAG/ (*.DCM)
│       └── T2WI/   (*.DCM)
├── LVM/                           # Lateral Ventricular Megaly
│   ├── clinical_data.csv
│   └── 100-xxx/ ...
├── PVL/                           # Periventricular Leukomalacia
│   ├── clinical_data.csv
│   └── 010-xxx/ ...
└── LVM_PVL/                       # LVM + PVL
    ├── clinical_data.csv
    └── 110-xxx/ ...

5. CSV Column Description

Column	Type	Description
patient_id	string	Unique patient identifier (e.g., 001-441)
group	string	Group folder name: normal, LVM, PVL, LVM_PVL
group_label	int	Numeric label: 0=Normal, 1=LVM, 2=PVL, 3=LVM+PVL
group_name_en	string	Full English group name
exam_description	string	Radiologist's MRI examination description (Chinese)
diagnosis	string	Final diagnosis conclusion (Chinese)

6. Notes

• Medical text (exam_description, diagnosis) is kept in the original Chinese to preserve clinical accuracy. Machine translation of specialized medical radiology reports may introduce errors.
• Original xlsx files are retained in each folder as backup.
• Removed patients: 3 patients (100-21, 110-14, 110-52) were excluded due to missing T2-SAG channel. Both their DICOM folders and CSV records have been removed.
• Disease description document: 新生儿侧脑室扩张+脑白质软化疾病描述 AI+医生审核版本.docx is preserved as-is (reference document, not patient data).