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NBI: A Breakthrough in the Early Detection of Gastrointestinal Cancer

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Endoscopy Department
Learn about Narrow Band Imaging (NBI) technology, which helps accurately detect early gastrointestinal cancers, increasing treatment opportunities and improving quality of life.

1. What Is Narrow Band Imaging (NBI)?

Narrow Band Imaging (NBI) is an advanced endoscopic technique that uses specialized light to enhance contrast and clearly visualize blood vessels and mucosal surface structures.

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1.1. How NBI Technology Works

NBI operates based on the principle of light absorption by hemoglobin in the blood and the different penetration depths of various light wavelengths into tissue [1, 2]. The NBI system uses optical filters to produce two narrow bands of light:

  • Blue light (approximately 415 nm): This short wavelength penetrates superficially into the mucosal surface. It corresponds to the peak absorption of hemoglobin, highlighting superficial capillaries on the mucosal surface [1, 2, 3].
  • Green light (approximately 540 nm): This longer wavelength penetrates deeper into the submucosal layer, allowing deeper blood vessels to be visualized [1, 3].

By analyzing how these wavelengths are absorbed and reflected, NBI produces pseudo-color images in which blood vessels and mucosal surface structures appear more clearly in brown or blue, while surrounding tissue appears green [2, 3]. This helps physicians more easily identify subtle morphological and vascular changes that may be early signs of precancerous and cancerous lesions [3].

2. Comparison of NBI with Conventional White Light Endoscopy

Conventional White Light Endoscopy (WLE) uses the full visible light spectrum to illuminate and examine the mucosa [3]. Although WLE can detect large lesions, small, flat, or early lesions may be missed due to insufficient contrast [1].

NBI overcomes this limitation by:

  • Enhancing contrast: NBI highlights blood vessels and microstructures of the mucosa, making it easier to distinguish healthy tissue from pathological tissue [3].
  • Providing more detailed detection: Small, flat lesions or vascular changes that are difficult to detect with the naked eye under white light are displayed more clearly with NBI [1].
  • Eliminating the need for dyes: Unlike conventional chromoendoscopy, which requires dyes to be applied to the mucosa to enhance visualization, NBI achieves this instantly at the touch of a button, saving time and reducing patient discomfort [3].

3. Role of NBI in the Diagnosis of Early Gastrointestinal Cancer

NBI plays a key role in the diagnosis of early gastrointestinal cancers, including cancers of the esophagus, stomach, and colorectum, due to its ability to visualize subtle changes in the mucosa and blood vessels [3].

3.1. Early Detection of Precancerous Lesions and Early-Stage Cancer

Gastrointestinal cancers often develop from precancerous lesions or carcinoma in situ. Detecting these lesions at a very early stage is a key factor in treatment effectiveness. NBI helps physicians:

  • Identify abnormal vascular changes: Rapidly growing cancer cells require an increased blood supply, leading to the formation of new blood vessels (angiogenesis) with abnormal characteristics, such as dilation, tortuosity, and irregularity [1, 3]. NBI highlights these blood vessels, helping identify areas suspicious for cancer even when lesions are very small and do not show clear signs on conventional endoscopy [1].
  • Visualize mucosal surface structures: NBI allows clear visualization of pit patterns and mucosal surface structures, which may change in precancerous and cancerous lesions [3]. For example, in the esophagus, changes in intrapapillary capillary loops (IPCLs) are important signs for lesion classification [3].
  • Increase detection rates: Studies have shown that NBI increases the detection rate of precancerous lesions and superficial squamous cell carcinoma of the esophagus compared with white light endoscopy [12, 13].

3.2. Improving the Accuracy of Lesion Classification

NBI not only helps detect lesions but also supports lesion classification, assessment of their nature (benign or malignant), and estimation of the depth of invasion [3]. NBI-based classification systems have been developed for different organs of the gastrointestinal tract:

  • Esophagus: IPCL classification helps assess the degree of dysplasia and depth of invasion of squamous cell carcinoma [11].
  • Stomach: NBI helps identify areas of intestinal metaplasia, a precancerous condition, and distinguish adenomas from early carcinoma. Signs such as the “light blue crest” or “white opaque substance” may support diagnosis [3].
  • Colorectum: Classification systems such as NICE (NBI International Colorectal Endoscopic) and JNET (Japan NBI Expert Team) help distinguish hyperplastic polyps from adenomas and deeply submucosal invasive carcinoma, thereby guiding appropriate management [3].

3.3. Supporting Biopsy and Minimally Invasive Treatment

With its ability to clearly visualize abnormal areas, NBI helps physicians accurately identify sites for biopsy, improving specimen accuracy and reducing the number of random biopsies [3]. This is particularly important in Barrett’s esophagus surveillance programs, where random biopsies may miss lesions [3]. In addition, NBI helps determine lesion boundaries before endoscopic resection procedures such as endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD), helping ensure complete removal of pathological tissue and reducing the risk of recurrence [4].

4. Outstanding Advantages of NBI

NBI offers several significant advantages over conventional endoscopy, contributing to improved diagnosis and treatment of early gastrointestinal cancers.

4.1. Enhanced Visualization of Mucosal Details

NBI uses narrow-wavelength light that is strongly absorbed by hemoglobin, highlighting the capillary network and surface structures of the mucosa [1]. This allows physicians to clearly observe subtle changes that may be missed with white light endoscopy, such as changes in the size, shape, density, and arrangement of small blood vessels or glands on the mucosal surface [3, 10]. This capability is particularly useful for detecting flat or depressed lesions, which can be very difficult to visualize.

4.2. Minimizing Missed Lesions

By visualizing early signs of angiogenesis and changes in mucosal structure, NBI helps reduce the rate of missed precancerous and early cancerous lesions [3]. This is particularly important in screening programs for high-risk patients, such as patients with Barrett’s esophagus, in whom NBI may improve the detection of dysplasia [3]. One study showed that NBI doubled the detection rate of early squamous cell carcinoma in the head and neck region compared with conventional methods [1].

4.3. Contributing to Improved Prognosis and Quality of Life

Detecting cancer at the earliest possible stage significantly increases cure rates and prolongs survival [1, 5]. When lesions are detected early, less invasive treatment methods such as endoscopic resection (EMR, ESD) can be used instead of major surgery, helping patients avoid serious complications, reducing hospital stays, enabling faster recovery, and maintaining a better quality of life [4]. NBI is an effective tool that supports this goal.

5. University Medical Center Ho Chi Minh City Applies NBI Technology

University Medical Center Ho Chi Minh City (UMC) is committed to pioneering the application of modern medical technologies to improve the quality of diagnosis and treatment for patients. NBI endoscopy has been effectively implemented at the hospital, providing numerous practical benefits.

5.1. Modern Equipment

UMC is equipped with a modern endoscopy system featuring advanced NBI technology, ensuring high-quality, clear, and detailed images of the gastrointestinal mucosa. These devices are regularly maintained and upgraded according to international standards, enabling physicians to perform procedures accurately and safely.

5.2. Highly Qualified Medical Team

The Endoscopy Department of University Medical Center Ho Chi Minh City brings together experienced physicians and endoscopy specialists with advanced training in NBI techniques. The physicians are not only proficient in operating the equipment but are also capable of accurately interpreting and analyzing NBI images, helping provide timely diagnoses and the most appropriate treatment plans for each patient.

5.3. Benefits for Patients

The application of NBI technology at UMC provides numerous benefits for patients:

  • More accurate diagnosis: The ability to detect and accurately classify precancerous lesions and early-stage cancers allows patients to receive timely treatment and increases their chances of cure.
  • Effective treatment: Early diagnosis facilitates less invasive treatment methods such as endoscopic resection, helping reduce pain, shorten recovery time, and improve quality of life.
  • Greater confidence in treatment: With the combination of advanced technology and a dedicated, professional medical team, patients can feel confident when undergoing NBI endoscopy and treatment at University Medical Center Ho Chi Minh City.

6. Frequently Asked Questions (FAQ)

  • Is NBI endoscopy painful? NBI endoscopy is performed similarly to conventional endoscopy. If the patient receives anesthesia or sedation, they will not feel pain during the procedure. After endoscopy, there may be mild discomfort in the throat or abdomen, but this usually resolves quickly.
  • Is NBI endoscopy expensive? The cost of NBI endoscopy may be slightly higher than that of conventional white light endoscopy due to its advanced technology and specialized equipment. However, the benefits of early diagnosis and accurate lesion detection provided by NBI are substantial and may help reduce long-term treatment costs if disease is detected early.
  • Do I need to avoid eating or drinking before NBI endoscopy? Yes. Patients need to fast for at least 6–8 hours and avoid drinking for 2–4 hours before endoscopy to ensure an empty stomach (for upper gastrointestinal endoscopy) and a clear field of view. For colonoscopy, bowel preparation should be performed according to the physician’s instructions.
  • How often should NBI endoscopy be performed? The frequency of NBI endoscopy depends on individual risk factors, medical history, and the results of previous endoscopies. The physician will provide specific recommendations based on your health condition.
  • Can NBI detect all types of gastrointestinal cancer? NBI is a highly effective diagnostic tool for detecting early gastrointestinal cancers, particularly carcinomas. However, no method is completely infallible. Some rare types of cancer or lesions located deep beneath the mucosa may be more difficult to detect. Combining NBI with other diagnostic methods (such as endoscopic ultrasound or CT scans) can improve diagnostic accuracy.

7. References

The information above is for reference purposes only and is not intended as medical advice. Please contact your doctor for detailed medical consultation.

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Bệnh Viện Đại Học Y Dược TP. Hồ Chí MinhUng thư đường tiêu hóaChẩn đoán sớmCông nghệ y tếNBI Endoscopy
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