"咳嗽老不好，去拍个CT？" "总是头疼，要不要做CT？" "几个月前刚做过CT，再做会不会有问题？" "听说CT辐射能致癌，是真的吗？" …… 时值岁末，又到一年体检高峰期，加之冬季气温骤降，呼吸道疾病高发频发，CT检查的需求随之明显 增加。针对常见疑问与认知误区，国家应急广播专访首都医科大学附属北京胸科医院影像科主任侯代 伦，带您一同揭开CT检查的"迷雾"。 体检报告上突然出现的"肺结节"字样，总是让人心头一紧，更让人纠结的是，医生往往会叮嘱3个月后 做CT复查，不少人犯起嘀咕：肺结节复查到底要不要拍CT？侯代伦表示，筛查肺结节首选低剂量CT。 X光曾用于肺癌筛查，确实能发现体积较大的肿块，但对于微小的肺结节是看不到的。不过，在肺部手 术后观察疗效、排查并发症时，胸片因辐射剂量更低，更为适用。 那么，同一部位为何会有多种检查方式？X光、CT、核磁共振到底有什么区别？侯代伦介绍，X光、CT 和核磁共振的成像原理不同，成像效果也存在明显差异。X光拍出的图像呈黑白灰色，本质上是一种透 视影像。它利用X射线穿透受检部位，再根据密度差异，最终呈现出平面图像。CT在X光基础上进一步 今年以来，"CT致癌"的说法不绝于 ...

Core Viewpoint - The White House announced that former President Trump's MRI results are "completely normal," indicating good overall health at the age of 79 [1]. Group 1: Health Status - Trump's cardiovascular and abdominal imaging results were reported as completely normal [1]. - The announcement comes amid ongoing public concern regarding Trump's health, particularly after observations of swelling in his ankle and bruising on his hand [1]. Group 2: Public Perception - Prior to the release of the MRI results, Trump declined to disclose specific details about the areas examined, only stating that the brain was not included [1].

Core Viewpoint - Breast cancer is the most common malignant tumor among women globally, with an increasing incidence rate, approximately 2.3 million new cases reported annually according to the World Health Organization [1] Group 1: Incidence and Demographics - The incidence of breast cancer is rising both globally and in China, with a notable increase in younger patients [3] - Breast cancer typically occurs more frequently in women around the ages of 55 to 60, with a secondary peak in women around 40 years old [3] - Younger breast cancer patients tend to experience faster disease progression and a higher likelihood of lymph node metastasis [3] Group 2: Symptoms and Self-Examination - The primary symptom of breast cancer is a breast lump, with about 80% of patients presenting with this symptom at diagnosis [5] - Most early-stage breast cancer patients do not exhibit obvious symptoms, making regular self-examination crucial [5] - Recommended self-examination frequency is once every one to two months, including visual checks for skin changes and nipple discharge [7] Group 3: Screening and Diagnosis - Due to the uncertainty of self-examinations, regular hospital screenings are essential, including ultrasound, mammography, MRI, and ductoscopy [9] - Early-stage breast cancer often presents with calcifications that are difficult to detect via ultrasound, necessitating mammography for accurate diagnosis [9] - It is advised that women over 40 undergo mammography screenings every one to two years, especially if abnormalities are detected on X-rays [11]