An x-ray or CT scan of the main differences that it is better and safer?
X-ray examination is the most optimal way is a non-invasive (no penetration)visualization of internal organs. X-ray diagnostics is one of the most commonly used techniques in modern medicine. One of the varieties of x-ray examination of the internal organs is computed tomography. This method allows to obtain higher quality images, which is important for complex pathologies of the internal organs.
In some cases, shows the x-ray?
Due to the fact that diagnostic radiology is the easiest and cheapest way of obtaining information about the condition of the internal organs, this method is the main method of diagnosis in the following cases:
Contraindications for this method of diagnosis a little bit:
- pregnancy at any time;
- the serious condition of the patient;
- continued internal bleeding.
Because all such research is strictly accounted for, they are not assigned in the case of the patient’s maximum permissible radiation dose. Side effects such a diagnosis is not – except in cases involving the use of contrast agents. When administered intravenously, may experience allergic reactions, when oral administration is not expressed disorders of digestion, which often do not require special treatment.
KT represents a more modern method of research, allowing to obtain cross-sectional image of any internal organs. CT and x-ray methods are similar, but the imaging allows to obtain more high-quality images that are high resolution.
While x-ray remains safer as the radiation dose received during the study less. To choose CT or x-ray will be more informative in the specific case, only the doctor.
Modern complexes to tomography have expressed differences from the first, which appeared in the early 80s. currently, a widely used apparatus, characterized by reduced radiation exposure. The latest generation of scanners has a huge number of sensors which greatly reduce the scanning time and reduce radiation dose. This allows the use of this type of diagnosis as often as x-rays.
If necessary, the most detailed examination of internal organs shall be appointed or multilayer spiral (multidetector) CT.
The wide spread of this technology scan has received in the 90-ies. Its essence lies in the following two steps simultaneously – rotation x-ray tube around the patient, and movement in the longitudinal direction. The speed of the table can vary and is determined by the specific objectives of the scan.
Unlike the spiral patterns, for multiresidue tomography there are several detectors positioned around the circumference of Henry, and the emitted beam has acquired a different geometric shape. Feature of the present complexes to CT is the ability to scan the body as a whole, and monitor in real-time. This is true in the study of the brain, heart or lungs.
What distinguishes x-rays and imaging?
Unlike most simple CT scan, x-rays, allows to obtain images in the same plane. On the radiograph is not always detected tumors, especially at the initial stage, when the tumor is large. X-ray allows you to explore complex organs in real time – so that fluoroscopy can visualize the digestive tract, but it is not applicable for the study of the brain.
Advantages of computed tomography in its various versions, you need to:
- tissue resolution as high – attenuation factor of 0.5% for CT and 20% for x-rays;
- completely absent closed areas – the bodies do not overlap each other;
- A CT scan allows the doctor to assess the size of the bodies in the study area;
- to obtain additional information through the use of application programs.
In addition, CT does not preclude the use of contrast – it can be intravenously and orally.
Indications for computed tomography
Indications for CT are somewhat different from the indications for x-rays – their list more impressive. It is designed to study:
- of the brain;
- the heart and lungs;
- any hollow and parenchymal internal organs;
- joints and bones;
- of the endocrine glands;
- in practice, dental CT has become the preferred research method due to speed and informative.
In the appointment of any method of x-ray examination should inform the doctor about any recent medical procedures, especially if they were conducted in private. In addition, when using contrast need to mention about all the allergic reactions observed in the course of life.
How is CT?
Special preparatory activities before such a study is not required. 4 hours before procedure, stop taking food and liquid. If necessary medication is permitted a small amount of water. The procedure of research of one area takes up to 20 minutes. The table on which the patient is equipped with straps to fear they should not be, they are used to maintain the desired position. If the designated contrast, it runs directly before the examination.
During the procedure, observe the stillness, to breathe evenly through the nose. In some cases, with the doctor sounds instructed to hold your breath – such a request is valid. You need to understand that the unauthorized movement during scanning leads to defects and need re-examination. If necessary, CT child allowed in parents room – in this case, they wear special lead aprons.
Contraindications and disadvantages of CT
The main contraindications for CT is identical for all methods of radiological diagnosis. In addition, because the patient is forced to remain in a fixed position, sometimes up to half an hour, the procedure is not possible when expressed emotional arousal. In some cases, for its relief, apply a medicine is the introduction of them is assigned and supervised by a doctor.
Contraindication is pregnancy. The minimum dose of irradiation and informational value do computed tomography the best method of diagnosis. To the main disadvantage is the cost of the procedure.