One of the most important things when searching for a doctor to your place of residence is to search for a specialty along with a location close to your place of residence or work. This happens mostly in big cities like Tehran where the traffic of vehicles is very high and there is heavy traffic. ### **Radiology** Radiology is a science that deals with the use of images to diagnose and sometimes treat diseases in the body. The variety of imaging techniques is very large and we can refer to X-ray, ultrasound, CT scan, PET and MRI techniques. Interventional radiology can be used in minimally invasive surgeries, which can be used as a guide for imaging technology. **What is a radiology device?** The structure of the radiology device is such that it works based on X-rays. This device requires very high voltage. Using this device because it requires a very high voltage may cause problems such as power outages in the entire city. What is ultrasound? Ultrasound is a device and a type of imaging method that uses high-frequency sound waves. Using this device, the internal organs of the body can be seen. Using this device, doctors and specialists can see the heart, blood vessels, kidneys, liver and other internal organs of the body that are not visible. Doctors use this device to observe the fetus for people who are pregnant. Unlike X-rays, the waves of this device are not harmful. During the examination, the patient is placed on a bed and the doctor moves a device called a transducer over the part of the body that needs ultrasound. This transducer passes the sound waves through the body and takes pictures of the internal tissues of the body. The transducer device is such that it can image and record the sound waves that have passed through it. **Communications with Dr. Saif Ultrasound Center Contact numbers: 88553310, Address: Tehran, Yusuf Abad, Fathi Shaghaghi St., between Chehelston and Biston, No. 74, Shaghaigh Radiology and Ultrasound Page sonography of Dr. Saif** **What are the necessary preparations for ultrasound?** When a person has to do an ultrasound, he should wear comfortable and appropriate clothes and pants, if he has used jewelry in the desired area, he should take them off. In order to take pictures of some parts, the doctor asks the person to drink up to six glasses of water and not to empty his bladder. **Types of ultrasound in general** Ultrasound is generally divided into seven types, which we will discuss below. 1. Transvaginal ultrasound: This type of ultrasound method is used for imaging inside the vagina, which is often performed during early pregnancy. 2. Conventional ultrasound: In this type of method, a transducer is used, which moves and takes images in areas where it is needed, such as the abdomen. Conventional ultrasound is also used for two-dimensional imaging of the fetus. 3. Specialized ultrasound: this method is the same as normal ultrasound. But in this method, it is used to detect suspicious cases and more complex tools are used. 4. Color imaging: In this type of imaging, slight changes in the frequency of ultrasonic waves are measured. In this method, moving objects such as blood cells are imaged. The conditions in which the doctor prefers to use this type of ultrasound method are: Examination of venous problems, especially varicose veins Evaluation of the amount and speed of blood flow in the kidneys The presence of blocked blood vessels in all areas of the body such as the neck, arms and legs When blood clots are observed in the upper and lower limbs such as the legs. Checking the condition of blood flow after stroke complications 5. 3D ultrasound: In this method, it produces 3D images of the fetus using special probes that have been designed in advance and using special software. The importance of three-dimensional ultrasound is: In this method, all organs of the child's body can be seen from head to toe. With this method, existing abnormalities can be detected in time. Decision making regarding intrauterine surgery Decision making regarding the continuation of pregnancy according to the recognition of abnormalities 6. 4D or 3D dynamic ultrasound: This type of method is used to observe the face and movements of the fetus using very powerful scanners. 7. Fetal echocardiography: In this method, ultrasound waves are used to evaluate the anatomy and function of the child's heart. This ultrasound method helps the doctor to find out about the congenital heart defects of the fetus. **The benefit of using ultrasound** In some cases, ultrasound is used instead of radiology because radiology has X-rays. You need to know that the dose of X-rays available in radiology is very low, but still, for some cases, such as taking pictures of pregnant women, the doctor recommends ultrasound because this radiation, no matter how small, may still affect the fetus. In ultrasound, because ultrasonic waves are used, these problems are prevented. **What is ultrasound used for?** Ultrasound has many applications in the treatment and diagnosis of various diseases. Some of these applications are: Diagnosis of metabolic bone diseases Examining the inflammations in the joints Examination of the thyroid gland Examination of breast masses Examining the problems of the male reproductive system and the prostate gland Diagnosis of bladder problems Evaluation of blood flow in different parts and organs of the body Helping to perform biopsy in the diagnosis and treatment of all types of tumors Observing the ovaries and uterus during pregnancy and monitoring the growth and development of the fetus **Conclusion** Ultrasound and radiology are two of the most important departments in ultrasound centers. Choosing a good ultrasound center can play an important role in the result. Therefore, it is better to get enough information before referring to an ultrasound center.