This is an automatically translated article.
99mtc bone scan is a modern and safe procedure in the Department of Diagnostic Imaging and Nuclear Medicine. The method allows imaging on radiographs, but they have very low radiation exposure. Radiolabeled substances do not store but are eliminated outside the body very quickly.
1. What is 99mtc bone scan?
Bone scan with English name is bone scan to help diagnose and detect bone diseases. Usually, when the patient has signs of unexplained bone pain or bone injury, an X-ray is indicated. But results on X-ray images that do not detect abnormalities will be combined with bone scans.
This method has high sensitivity and plays an important role in detecting cancers that have spread to the bone .
99mtc bone scan will use radioactive drugs with similar metabolism to calcium and phosphorus (99mTc -MDP) during the scan. At that time, they will be concentrated in the areas of bone regeneration much higher than normal bone organization and easily detect the damaged bone on the scan. Three-phase imaging: perfusion, organization, and late phase (bone) help in differential diagnosis of bone lesions, osteomyelitis and soft tissue inflammation (Cellulitis).
Xạ hình xương cho phép phát hiện tình trạng ung thư đã di căn đến xương.
2. Indications and contraindications
2.1. Point
In the following cases, 99mtc bone scan will be indicated:
Unexplained bone pain Injury leading to fracture Arthritis Paget bone patient Primary bone cancer Bone metastatic cancer Osteoporosis Osteoarthritis for bone biopsies
Người bệnh loãng xương được chỉ định chụp xạ hình xương
2.2. Contraindications
This technique is contraindicated for pregnant or lactating women. Because bone scans use radioactive substances that have the potential to negatively affect fetuses and infants.
Therefore, if you are suspicious or in the process of being pregnant, you should notify your doctor.
3. How is 99mtc bone scan done?
3.1. Before shooting
On the patient's side, they should not eat, drink or be active before the 99 mtc bone scan. If you are taking any medications, especially those containing bismuth, you should inform your doctor. Because this drug ingredient can cause erroneous bone scan results.
If the radiologist has had a barium X-ray within 4 days, the doctor will consider the decision to have a bone scan. At the same time, the radiographer is instructed to remove all metal instruments on the body before the bone scan.
On the hospital side, specialized equipment is fully and carefully prepared such as: Gamma Camera SPECT, SPECT/CT with wide field of view; Gamma radiation dosimeter, radiation detector and drugs for the scanning process.
3.2. Shooting process:
Step 1: Extraction - Label the radioactive drug
The doctor extracted 99mTc from the 99Mo-99mTc extraction flask. Next, 99mTc-pertechnetate solution will be pumped into the MDP vial and shaken well. Incubation time is within 20 minutes to 30 minutes at room temperature. Suction dose of 99mTc-MDP 15-20 mCi for each patient.
Step 2: Inject radioactive drugs and take measurements
The patient is sitting or lying down, intravenously injecting a dose of 99mTc-MDP 15-20 mCi for each patient.
Record after injection 2.0 -3.0 hours. The patient is instructed to lie on his back, with his arms by his side. Uses low energy, high resolution directional envelope (LEHR), 20% energy window.
Perform 2 plane plane recording of the whole body before, after and other injury locations.
3.3. After shooting
After the bone scan, the patient can go home without having to stay in the hospital for further monitoring. This method is safe and will usually have no side effects. Radioactivity in the body from the scan will be eliminated within 2 days.
Chụp xạ hình xương là phương pháp thực hiện nhanh chóng và ít rủi ro
4. Results of bone scan 99 mtc
The 99 mtc bone scan results allow the doctor to assess whether the examiner is normal or has any bone problems. The specialist will inform the patient of the scan results to look for abnormal bone metabolism. Specifically:
Normal bone and joint areas when recorded are reproduced on 3 planes: axial, coronal, sagittal. Radiopharmaceuticals are evenly concentrated on the body, there is no defect or abnormal increase or decrease in radioactivity. Injured joints appear different dark and light colored spots on the scan image. Images can signal diseases caused by disorders in the bones such as cancer, arthritis, bone infections. Based on this result, the doctor can recommend a treatment for the patient such as amputation surgery (patients with bone sarcoma) or not?
Vinmec International General Hospital is a high-quality medical facility in Vietnam with a team of highly qualified medical professionals, well-trained, domestic and foreign, and experienced.
A system of modern and advanced medical equipment, possessing many of the best machines in the world, helping to detect many difficult and dangerous diseases in a short time, supporting the diagnosis and treatment of doctors the most effective. The hospital space is designed according to 5-star hotel standards, giving patients comfort, friendliness and peace of mind.
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