What is computed tomography (CT) scan?

In computed tomography, or CT in short, X ray beam rotates around an object to produce multiple projections. The acquired data will be processed by computer to create multiple cross-sectional images. It enables viewing of the internal structures of different body parts. It is one of the most widely used cross-sectional imaging techniques.

---

What is special about our CT scanner?

HKAI is using Siemens SOMATOM Drive. It is one of the highest-end models on the market, incorporated with dual source and the latest technology. Only 3 machines are available in Hong Kong.

Our dual source CT scanner has two sets of x-ray tubes and detectors that can emit X Ray and acquire data at the same time. In contrast to the conventional single source CT, dual source CT can acquire images twice faster.

The novel technologies in SOMATOM Drive further improve precision, efficiency and patient safety without compromising image quality. The scanner has unique features of superfast scanning time to minimize breathing and motion artifacts, lower radiation dose, and lesser contrast media requirement. Thus, patient experience can be improved. It also has various advanced clinical applications such as cardiovascular imaging, functional imaging, pediatric and elderly imaging.

---

What should I do for the CT exam?

Before the exam

1. Our medical staff will collect your medical history
2. Please provide previous medical films and reports such as CT, MRI or ultrasound for reference.
3. Fasting for 4 hours is needed before contrast CT exam
4. Oral contrast may be required for abdominal exam to improve the diagnostic quality
5. Please remove any metallic objects such as watches and jewelry

During the exam

1. You will be lying on the table. Our radiographer will help with your positioning
2. The CT table will carry you into the CT gantry for image acquisition
3. Please keep still and follow the breathing instruction during scanning
4. Injection of intravenous contrast media may be needed in certain exam to improve diagnostic quality
5. Heat and nausea are common after contrast injection. Please understand that these are normal reactions, and they will disappear within a few minutes.

After the exam

1. Resume normal eating and drinking

---

Precautions

Please inform our medical staff if you have any of the following conditions:

1. Pregnant or may be pregnant
2. History of adverse reaction to contrast media
3. History of asthma, kidney disease, heart disease, hypertension, diabetes mellitus and thyroid disease

---

健康篩查計劃