Indications and contraindications for X-ray CT and MRI examinations

  [X-ray fluoroscopy + plain film] Indications
  1.Thoracic fluoroscopy: observation of the lungs, diaphragm movement, pulsation of the large blood vessels of the heart.
  2.Abdominal fluoroscopy: acute abdomen, peristalsis and emptying of gastrointestinal tract, obstruction of gastrointestinal tract, urinary system.
  3.Bone examination of the whole body: fracture, dislocation of joint, positive foreign body.
  [X-ray imaging]
  1.Barium gastrointestinal imaging: indications esophageal, gastrointestinal and other lesions, as well as masses in the adjacent tissues of the gastrointestinal tract, etc. Such as esophageal cancer, esophageal varices, gastroduodenal ulcers and tumors, understanding the enlargement of atrial chamber of heart disease, mediastinal tumors, etc. Contraindications gastrointestinal hemorrhage within one week, gastrointestinal perforation, severe intestinal obstruction. Preoperative preparation: fasting on the day of examination. Precautions: Eat only after all barium in the stomach is emptied.
  2.Barium enema: indications colon and part of the terminal ileum lesions, especially those with obstruction symptoms should not be examined by oral method. Such as colonic inflammation, tumors, giant colon, etc. Contraindications necrotic lesions of the colon, colonic haemorrhage. Preoperative preparation: fluid or less gas-producing food one day before the examination, clean enema once 4 hours before the examination.
  3.Urinary tract angiography (intravenous pyelogram): mainly used to check the kidney, ureter, bladder and urethra lesions. ‘Indications urinary tract stones, tuberculosis, tumors, congenital malformations, unexplained hematuria, urinary tract obstruction, or to understand renal function. Contraindications Allergy to contrast agent. Preoperative preparation: oral laxative the day before, or clean enema on the same day, water abstinence for 6-12 hours before the examination, and allergy test to contrast agent. Retrograde pyelogram: mainly used to observe the morphology of the renal pelvis and ureter, or for those who are not suitable for intravenous pyelogram due to poor renal function. Cystography: Indications: bladder lesions (tumors, stones), prostate lesions, or intrapelvic masses. Contraindications: Severe urethral stricture, or inappropriate for catheterization.
  4.Hysterosalpingography: Indications: infertility, deformity of the reproductive tract, abnormal bleeding from the uterus. Contraindications: general debility, acute inflammation of the reproductive tract, in case of uterine bleeding, pregnancy, or allergy to contrast media. Preoperative preparation: iodine allergy test, contrast should be performed within 4-10 days after menstruation.
  [CT plain]: Indications.
  1, head: traumatic brain injury, cerebral hemorrhage, cerebral infarction, vascular malformation, brain tumor, abnormal brain development, etc. It is the preferred examination method for acute cerebral infarction, cerebral hemorrhage and craniocerebral trauma.
  2.Maxillofacial and neck: maxillofacial tumor, fracture, inflammation, etc. such as intraorbital lesions, sinus cancer, nasopharyngeal cancer, middle ear mastoid lesions and thyroid disease, neck masses, etc.
  3.Thorax: various tumors, tuberculosis, inflammation, bronchiectasis, lung abscess, pulmonary atelectasis, pneumothorax, fracture, esophageal foreign body and various variants of lung, pleura and mediastinum
  4, abdominal and pelvic cavity: mainly used for the diagnosis of diseases of the liver, bile, pancreas, spleen, peritoneal cavity, retroperitoneal space, urinary and reproductive systems, the display of the site and cause of intestinal obstruction, and the display of gastric cancer, colon cancer and its degree of invasion of extra-cavitary structures and distant metastases is of great value.
  5.Skeletal system: fine fractures of the skull and spine, intervertebral disc lesions, spinal stenosis, bone tumors, bone tuberculosis and inflammation, etc., and the ability to perform 3D imaging and multi-slice imaging of lesion sites.
  6.Vascular system: CT vascular imaging can show arterial lesions, such as vascular occlusion, aneurysm and sandwich aneurysm, vascular malformation, vascular injury, cardiac coronary artery lesions, etc. Contraindications: coma, irritability; shock, hemorrhage and other critical illnesses; pregnancy (fetus); adolescent genital (sensitive) area examination.
  [Enhanced CT]: Indications.
  1.Distinguish normal or abnormal vascular structures and clarify pathological vessels to better determine the nature of lesions.
  2.Displaying masses with related blood vessels.
  3.Improve the detection rate of lesions.
  4.Improve anatomical details, determine the extent of lesions and clinical staging, and improve the accuracy of tumor staging.
  5.Discover lesions that are not detected during plain scan. Contraindications.
  1.Contrast agent allergy.
  2.Severe liver and kidney function impairment.
  3.Severe thyroid disorders (hyperthyroidism). High risk factors.
  1, renal insufficiency.
  2, diabetes mellitus, multiple myeloma, water loss, severe cerebral atherosclerosis and cerebral vasospasm, acute pancreatitis, acute thrombophlebitis, severe cachexia, and other serious pathologies.
  3, asthma, cushings fever, urticaria, eczema and other allergic lesions.
  4, Cardiac lesions: such as congestive heart failure, coronary artery disease, arrhythmia, etc.
  5.Patients with previous iodine allergy and other drug allergy.
  6, Children under 1 year old and elderly people over 60 years old.
  MRI
  [Indications].
  1, cranio-cerebral diseases: congenital developmental malformations; various types of trauma; tumors; various inflammatory diseases, parasites; various cerebrovascular lesions (cerebral hemorrhage, cerebral infarction, cerebrovascular malformations, hemangiomas, etc.); hereditary diseases; cerebral metabolic diseases; check the cause of epilepsy
  2, spinal cord: degenerative diseases of the spine; cervicothoracic and lumbar disc deformation, bulging, prolapse, etc.; spinal stenosis; spinal slippage; inflammatory lesions of the spine; spinal tuberculosis; spinal osteomyelitis; epidural abscess; myelitis; arachnoiditis; spinal trauma; tumors; congenital developmental malformations of the spinal cord; review after spinal surgery
  3.Mediastinum and heart and lung: especially mediastinal lesions, which can be distinguished from large vessels without contrast; various congenital heart diseases, cardiomyopathies, aortic and pulmonary vascular lesions; pleural diseases; tumors, vascular variants, inflammation, etc.
  4.Hepatobiliary, pancreatic and spleen: diagnosis and differential diagnosis of various hepatobiliary tumors and tumor-like lesions; biliary tract diseases (stones, inflammation, bile duct dilatation, etc.); inflammatory tumors of the pancreas.
  5.Renal and adrenal glands: cysts, tumors, trauma, inflammation, congenital malformations of the kidney; adrenal tumors and hyperplasia, etc.
  6.Pelvis and reproductive system: bladder tumor, prostate lesion; uterus and adnexal tumor, inflammation, etc.
  7, skeletal muscle: diagnosis and differential diagnosis of benign and malignant tumors and tumor-like lesions of skeletal muscle; vascular lesions; trauma (especially small trauma, MRI can show bone contusion and other conditions)
  8.Joint: trauma (especially knee and meniscus injury); ischemic necrosis of various parts; various arthritis, observation of synovial effusion, etc.
  9, retroperitoneum: various tumors; retroperitoneal lymph nodes (metastasis)
  10.Pentosynthesis: trauma, tumor, inflammation, congenital malformation, etc. [absolute contraindication].
  1, the body is equipped with a pacemaker and nerve stimulator is strictly prohibited to scan
  2, there are aneurysm clips in the body, metal foreign body in the eye is strictly prohibited from scanning
  Patients with high fever should not be scanned [relative contraindication]: 1.
  1, if there are metal objects in the body (dentures, contraceptive rings, metal implants, postoperative metal clips) located in the scanning range should be carefully scanned to prevent metal without movement or heat generation to cause injury to the patient, metal objects can also produce artifacts resulting in misdiagnosis.
  2, coma, confusion, mental abnormalities, seizure-prone or cardiac arrest, serious trauma, claustrophobic patients, young children, extremely uncooperative people should be cautious
  3.Pregnant women and infants need to be approved by the doctor