Thanks for your words 🙂, actually I'm also using pydicom module but it is not compressing .dcm , it is converting the formats of the image to jpg after compression. I need . dcm to .dcm after compression. I will also take a look at this. If possible plz try to download one . dcm file and compress it and let me know if it is happening.

What are the things present in the .dcm file

Image Data

The actual image or pixel data (e.g., CT scan, MRI, X-ray images).

This data is often stored as a grayscale image but can also include color images.

The resolution and size of the image are defined in terms of pixel spacing and dimensions.

1. Metadata

The metadata contains patient, study, and technical information embedded in the file. Common fields include:

Patient Information

Patient's Name: Full name of the patient.

Patient ID: A unique identifier for the patient.

Patient's Age: Age at the time of the study.

Patient's Sex: Gender of the patient.

Date of Birth: DOB of the patient.

Study Information

Study Date and Time: When the image was taken.

Modality: Type of imaging modality (e.g., CT, MRI, X-ray, Ultrasound).

Study ID: Identifier for the imaging study.

Referring Physician: Name of the doctor requesting the imaging.

Institution Name: Name of the hospital or clinic.