---
title: Computed Tomography (CT)
url: "https://www.yyhmedical.com/en/guide/technology/ct-scan"
type: MedicalWebPage
inLanguage: en-US
---

# Computed Tomography (CT)

> Computed Tomography (CT) is an imaging technique that uses X-rays and computer processing to generate cross-sectional images of the body.

## Overview

Computed Tomography (CT) is an imaging technique that uses X-rays and computer processing to generate cross-sectional images of the body. Compared with conventional X-ray examinations, CT provides more detailed information about the location, size, shape, and extent of tumors.

  

CT is one of the most commonly used imaging examinations in oncology and plays an important role in cancer detection, diagnosis, staging, treatment assessment, recurrence monitoring, and long-term follow-up.

## Indications

CT is widely used in both solid tumors and hematologic malignancies.

  

For solid tumors such as lung, liver, gastric, colorectal, and pancreatic cancers, CT helps identify primary tumors, evaluate local invasion, and detect distant metastases.

  

For lymphoma, CT is commonly used to assess lymph node involvement and evaluate organs such as the liver and spleen. It is an important tool for disease staging and response assessment.

  

CT is also frequently used during and after chemotherapy, targeted therapy, immunotherapy, CAR-T therapy, or hematopoietic stem cell transplantation to evaluate treatment response and monitor for relapse.

## Examination Process

Before the examination, the physician will determine whether a contrast-enhanced CT scan is needed. Contrast-enhanced CT uses intravenous contrast material to improve visualization of tumors and blood vessels.

  

During the procedure, the patient lies on a scanning table while images are acquired. Most examinations take only a few minutes, although contrast-enhanced studies may require additional time.

  

Some abdominal or pelvic CT examinations may require fasting or drinking water beforehand, depending on the clinical indication and institutional protocols.

## Considerations and Limitations

CT is fast and widely available but involves exposure to ionizing radiation, so imaging should be performed when clinically appropriate.

  

Iodinated contrast agents used in enhanced CT studies may cause allergic reactions, and patients with impaired kidney function may require additional evaluation before contrast administration.

  

CT also has limitations in evaluating certain early lesions, bone marrow involvement, and soft tissue details. In some situations, MRI, PET-CT, ultrasound, or pathology may be needed to provide additional information.

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