ABSTRACT
BACKGROUND: With incremental utilization of pediatric cardiac CT in congenital heart disease, it is imperative to define its current radiation dose levels in clinical practice in order to help imagers optimize CT protocols, particularly in Asia and other developing countries where CT physicists are not readily available. OBJECTIVE: To evaluate current radiation dose levels and influencing factors in cardiac CT in children with congenital heart disease in Asia by conducting a retrospective multi-center, multi-vendor study. MATERIALS AND METHODS: We included 1,043 pediatric cardiac CT examinations performed in 8 centers between January 2014 and December 2014 to evaluate congenital heart disease. In five weight groups, we calculated radiation dose metrics including volume CT dose index, size-specific dose estimate, dose-length product and effective dose. Age at CT exam, gender, tube voltage, scan mode, CT indication and image reconstruction algorithm were analyzed to learn whether they influenced CT radiation dose. RESULTS: Volume CT dose index, size-specific dose estimate, dose-length product and effective dose of pediatric cardiac CT showed variations in the range of 4.3-23.8 mGy, 4.9-17.6 mGy, 55.8-501.3 mGyâcm and 1.5-3.2 mSv, respectively, within five weight groups. Gender, tube voltage, scan mode and cardiac function assessment significantly influenced CT radiation dose. CONCLUSION: This multi-center, multi-vendor study demonstrated variations in radiation dose metrics of pediatric cardiac CT reflecting current practice in Asia. Gender, tube voltage, scan mode and cardiac function assessment should be considered as essential radiation dose-influencing factors in developing optimal pediatric cardiac CT protocols.
Subject(s)
Heart Defects, Congenital/diagnostic imaging , Radiation Dosage , Tomography, X-Ray Computed , Adolescent , Asia , Child , Child, Preschool , Consensus , Humans , Infant , Infant, Newborn , Retrospective StudiesABSTRACT
Tracheobronchial foreign-body aspiration is a relatively frequent pediatric emergency and a cause of substantial morbidity and mortality especially in preschool children. Although foreign-body aspiration may cause sudden airway obstruction and subsequent death, quite often symptoms are mild and nonspecific; therefore, the correct diagnosis may be delayed particularly in the pediatric population. A delay in diagnosis increases the rate of complications and can cause substantial morbidity. Early and accurate diagnosis combined with intervention through foreign-body retrieval is critical for proper patient management. For evaluation of both radiopaque and non-radiopaque airway foreign bodies in pediatric patients, imaging plays an important role in initial detection and follow-up evaluation. In this article, we discuss the currently available imaging modalities and techniques for evaluating tracheobronchial foreign bodies in infants and children. Imaging findings of various tracheobronchial foreign bodies and mimics of foreign bodies are also discussed. In addition, information regarding management of tracheobronchial foreign-body aspiration is included.
Subject(s)
Airway Obstruction/diagnostic imaging , Bronchi/injuries , Foreign Bodies/diagnostic imaging , Respiratory Aspiration/diagnostic imaging , Trachea/diagnostic imaging , Trachea/injuries , Airway Obstruction/etiology , Bronchography/methods , Child , Child, Preschool , Early Diagnosis , Emergency Medical Services/methods , Female , Foreign Bodies/complications , Humans , Infant , Infant, Newborn , Male , Respiratory Aspiration/complications , Tomography, X-Ray Computed/methodsSubject(s)
Cough/etiology , Pneumonia/etiology , Tracheobronchomegaly/diagnosis , Bronchoscopy , Chronic Disease , Female , Humans , Middle Aged , Mycobacterium Infections, Nontuberculous/diagnosis , Mycobacterium chelonae/isolation & purification , Recurrence , Tomography, X-Ray Computed , Tracheobronchomegaly/physiopathologyABSTRACT
Congenital muscular dystrophy (CMD) comprises a heterogeneous group of disorders present at birth with muscle weakness, hypotonia and contractures. Congenital muscular dystrophy (CMD) comprises a heterogeneous group of disorders with muscle weakness, hypotonia and contractures present at birth. A particular subset of classic CMD is characterized by a complete absence of merosin. Merosin-deficient congenital muscular dystrophy (MDCMD) is a rare genetic disease involving the central and peripheral nervous system in the childhood. High signal intensities are often observed throughout the centrum semiovale, periventricular, and sub-cortical white matters on T2-weighted images in MRI brain in children with MDCMD. Apparent diffusion coefficient (ADC) map may reveal increased signal intensity and apparent diffusion coefficient values in the periventricular and deep white matters. These white matter findings, observed in late infancy, decrease in severity with age. The pathogenesis of these changes remains uncertain at present. In this article, we outline the specific MR imaging findings seen in a patient with documented MDCMD and also suggest the causes.
