What Is a Liver Scan?

Liver magnetic resonance examination technology is applicable to liver cirrhosis caused by various reasons (post-hepatitis, schistosomiasis, alcoholic sclerosis).

Liver magnetic resonance examination

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liver

Liver magnetic resonance examination

Liver magnetic resonance imaging techniques are suitable for:

Liver good,

1. Those with ECG pacemakers.

2. Those who can't remove using various metal rescue tools.

3. Those with metal clips left in the body after surgery. There is an irremovable metal implant near the examination site.

4. Women with early pregnancy (within 3 months) should avoid magnetic resonance scanning.

1. Carefully check the magnetic resonance imaging (MRI) examination application form, understand the condition, and clarify the purpose and requirements of the examination. An application form with unclear requirements for examination purposes shall be confirmed with the clinical application doctor.

2. Confirm that the patient has no contraindications. The patient was instructed to read the precautions carefully and prepare as required.

3. Before entering the examination room, remove all metal objects, magnetic substances and electronic devices carried by the patient.

4. Tell the patient the time required for the examination, breathe calmly during the scan, and do not move at will. If you are unwell, you can contact the staff through the microphone.

5. Infants and young children, patients with restlessness and claustrophobia should be given appropriate sedatives or anesthetics according to the situation. Stop the test as soon as claustrophobia occurs, and remove the patient from the magnetic resonance examination room.

6. Acute and critically ill patients must be accompanied by a clinician when magnetic resonance examinations are required.

7. Equipment preparation

(1) Magnetic resonance machine. Select the appropriate special coil or special coil according to the inspection site.

(2) Prepare magnetic resonance contrast agent and use it if necessary.

1. sweep

(1) Examination position: The patient lies on his back on the examination bed, his head is advanced, the long axis of the human body is consistent with the long axis of the bed surface, and his hands are placed on both sides of the body or in front of his chest.

(2) Imaging center: The center of the horizontal axis of the coil is aligned with the midpoint of the line between the umbilical and xiphoid process. The center of the coil is the acquisition center, locked in position, and sent to the center of the magnetic field.

(3) Scanning method:

Positioning imaging: Quickly recommend the imaging sequence, and simultaneously make the crown, sagittal and axis three-direction positioning maps, and determine the scanning baseline, scanning method and scanning range on the positioning film.

imaging range: from the top of the diaphragm to the lower edge of the liver.

Recommended imaging sequence: SE sequence or fast sequence, cross-section T1WI and T2WI imaging; coronal T1WI imaging. If necessary, it can be supplemented with other recommended imaging sequences according to the condition and the conditions of the magnetic resonance equipment.

Imaging field (FOV): 30-40cm. Scanning range and imaging field can be set according to clinical examination requirements.

imaging layer thickness: 5 ~ 10mm.

imaging interval: 10% to 50% of the corresponding layer thickness.

Unitary matrix: 128 × 256 or 256 × 512.

2.Enhanced scanning

(1) Fast hand-push injection method: After the contrast injection, the post-enhancement scan is started. The imaging procedure is generally the same as the pre-enhancement T1WI procedure, or the fast gradient echo sequence, cross-section, sagittal and coronary T1WI. In some cases, a delayed scan can be added after the enhancement, which can be delayed for 5 to 30 minutes.

(2) Magnetic resonance syringe injection method: After the contrast injection, the post-enhancement scan is started. The imaging procedure is generally the same as the pre-enhanced T1WI procedure, or the same as the fast gradient echo sequence, the cross-section, sagittal and coronary T1WI. In some cases, a delayed scan can be added after the enhancement, which can be delayed for 5 to 30 minutes.

1. Master indications and contraindications.

2. Make preparations for inspection.

3. During the inspection, observe the patient's response closely and deal with any abnormalities in time.