Annual Number Of Examinations Research Articles

Pulmonary embolism during pregnancy: a 17-year single-center retrospective MDCT pulmonary angiography study

ObjectivesTo determine the prevalence of pulmonary embolism (PE) and alternative diagnoses detected by computed tomography pulmonary angiography (CTPA) in pregnant women; and to assess changes over time regarding radiation dose, technical quality, and examination frequency.Materials and methodsThis retrospective study included all pregnant women referred for CTPA due to clinically suspected PE over 17 years. Two blinded radiologists reviewed the CTPAs in consensus with regard to PE, alternative diagnoses, and technical quality. We retrieved patient data regarding radiation dose metrics and associated clinical and laboratory parameters. Subgroup comparisons were performed (Wilcoxon and Kruskal-Wallis tests).ResultsOf the 237 identified patients, 8 (3.3%) were excluded due to inadequate technical CTPA quality, and 229 patients were analyzed (mean age, 31.7 years; mean gestational age, 28 ± 7 weeks). The four different CT systems used over the study period had similar technical quality (p = 0.28). Of 229 patients 16 (7%) patients had PE, 144 (62.9%) had no abnormal findings, and 69 (30.1%) had an alternative diagnosis (consolidation, other pulmonary opacities, pleural effusion, and basal atelectasis). Gestational age, symptoms, and D-dimer levels were not significantly different between patients with or without PE (p > 0.05). Over time, radiation dose exposure decreased by 30% (p < 0.001), while the number of annual examinations increased by > 4-folds.ConclusionsIn pregnant women, CTPA rarely indicates PE and more often shows alternative diagnoses. Over 17 years, the use of CTPA in pregnancy has notably increased, while the radiation dose exposure has decreased by one third.Key Points• The use of CTPA in pregnancy has steadily risen over the last 17 years• In pregnant women, CTPA rarely reveals PE and more often shows alternative diagnoses• Recent technical improvements have substantially decreased the radiation dose exposure inherent in CTPA without reducing diagnostic image quality

POPULATION RADIATION EXPOSURE FROM DIAGNOSTIC NUCLEAR MEDICINE PROCEDURES IN TEHRAN 2011-14; TRENDS IN THE LAST 3 DECADES.

This study represents an update of Tehran population exposure from the diagnostic nuclear medicine procedures and the annual collective effective dose during 2011-14. The diagnostic nuclear medicine procedures data were collected from 58 out of 60 nuclear medicine centers in Tehran and were composed of the type and frequency of diagnostic examinations, radiopharmaceuticals used, administered activities, and age distribution of the patients. The annual number of examinations per 1000 population increased from 13.73 in 2011 to 22.59 in 2014 with an increase of 64.53% during 4 years. Most frequent examinations were cardiac (71.05%), bone (9.80%) and thyroid (7.26%) averaged over the 5 years. The collective effective dose increased from 807.74 person-Sv in 2011 to 1413.81 person-Sv in 2014. The effective dose per capita increased from 44.06 μSv in 2011 to 120.91 μSv in 2014, could be because of 70% increase of examinations, but ~3.42% increase in the population of Tehran.

French Population Exposure to Ionizing Radiation from Diagnostic Medical Procedures in 2007

The objective of this study was to update the 2002 data on medical exposure of the French population to ionizing radiation. It is based on 2007 data and only includes exposures from diagnostic procedures: conventional radiology, computed tomography, nuclear medicine, and diagnostic interventional radiology. Relevant data concerning the nature and frequencies of the examinations were obtained from two main sources: the national health insurance data for private practice and representative surveys in public hospitals for public practice. An “average” effective dose was assessed for each type of examination using principally dosimetric data collected to update the French diagnostic reference levels and professional guidance. The results showed that 74.6 million examinations were performed in 2007, leading to an average effective dose per inhabitant equal to 1.3 mSv per year. Conventional radiology and CT represented 63% and 10.1% of the examinations and 26.1% and 58.0% of the effective dose, respectively. The annual number of examinations per inhabitant was constant between 2002 and 2007 (about 1.2 examinations). However, the corresponding average effective dose per inhabitant increased by 57%, from 0.83 to 1.3 mSv per year. This increased dose was due mostly to a growing number of CT and nuclear medicine examinations. As recommended by the European Commission, studies should be conducted every 5 y to survey the evolution of medical exposure of the French population. Furthermore, specific studies should be conducted to evaluate whether this estimated increase in dose delivered for diagnostics is related to an increase in the medical benefit.

National survey 2007 on medical services for persons with intellectual disability in residential care in Israel

In Israel, the Office of the Medical Director of the Ministry of Social Affairs is responsible for the medical service in residential-care centers for persons with intellectual disability (ID). A standard annual questionnaire was developed during 1997-1998, and the first national survey study was conducted in 1998. This present paper presents the findings of the seventh national survey in 2007, for which the following information was gathered via questionnaires: age, gender, and level of intellectual disability of persons served at the residential care center in question, status of the population served, functional profile, nursing, medical, and allied professional staff, number of annual examinations, preventive medicine aspects, medications, number of annual cases of infectious disease, annual unintentional injuries, number of deaths, number of hospitalizations, internal residential center hospitalization, ambulatory out-patient use, use of outside laboratory examinations, and dental care. In 2007, 6,872 persons were served in 9 government, 37 private, and 13 public centers. The average number of persons served per center was 116.47 (range 24 to 341). The survey in 2007 showed that 79% of the population with ID in residential care in Israel was between the ages of 20 and 60 years old, 44% with severe or profound ID, 43% with moderate and 13% with mild ID. Twenty-seven percent were nursing patients, and 18% were confined to a wheelchair, 34% had epilepsy, 86% were found to be receiving medication daily for chronic illness, and 51% received psychotropic medication for psychiatric illness.

National survey 2004 on medical services for persons with intellectual disability in residential care in Israel

In Israel, the Office of the Medical Director of the Ministry of Social Affairs is responsible for the medical service in residential-care centers for persons with intellectual disability (ID). A standard annual questionnaire was developed during 1997-1998, and the first national survey study was conducted in 1998. This present paper presents the findings of the seventh national survey in 2004, for which the following information was gathered via questionnaires: age, gender, and level of intellectual disability of persons served at the residential care center in question, status of the population served, functional profile, nursing, medical, and allied professional staff, number of annual examinations, preventive medicine aspects, medications, number of annual cases of infectious disease, annual unintentional injuries, number of deaths, number of hospitalizations, internal residential center hospitalization, ambulatory out-patient use, use of outside laboratory examinations, and dental care. In 2004, 6,610 persons were served in nine government, 37 private, and 12 public centers. The average number of persons served per center was 113.97 (range 23 to 372). The survey in 2004 showed that 79.2% of the population with ID in residential care in Israel was between 20 and 60 years of age; 48.8% had severe or profound ID, 41% had moderate ID, and 10% had mild ID; 23% were nursing patients; 19% were confined to a wheelchair; 31% had epilepsy; 83% were receiving medication daily for chronic illness; and 52.5% were receiving psychotropic medication for psychiatric illness.

Diagnostic reference levels for the most frequent radiological examinations carried out in Brazil

A large-scale survey of doses to patients undergoing the most frequent radiological examinations was carried out in health services in São Paulo (347 radiological examinations per 1 000 inhabitants), the most populous Brazilian state. A postal dosimetric kit with thermoluminescence dosimeters was used to evaluate the entrance surface dose (ESD) to patients. A stratified sampling technique applied to the national health database furnished important data on the distribution of equipment and the annual number of examinations. Chest, head (skull and sinus), and spine (cervical, thoracic, and lumbar) examinations were included in the trial. A total of 83 rooms and 868 patients were included, and 1 415 values of ESD were measured. The data show large coefficients of variation in tube charge, giving rise to large variations in ESD values. Also, a series of high ESD values associated with unnecessary localizing fluoroscopy were detected. Diagnostic reference levels were determined, based on the 75th percentile (third quartile) of the ESD distributions. For adult patients, the diagnostic reference levels achieved are very similar to those obtained in international surveys. However, the situation is different for pediatric patients: the ESD values found in this survey are twice as large as the international recommendations for chest radiographs of children. Despite the reduced number of ESD values and rooms for the pediatric patient group, it is recommended that practices in chest examinations be revised and that specific national reference doses and image quality be established after a broader survey is carried out.

Nuclear medicine practice in Japan: a report of the 5th nationwide survey in 2002.

The Subcommittee on Survey of Nuclear Medicine Practice in Japan has performed a nationwide survey of nuclear medicine practice every five years since 1982 to provide detailed information on its current status. Questionnaires were sent to every institution known to the Japan Radioisotope Association to provide nuclear medicine examinations. The questionnaires address the number and kind of nuclear medicine examinations performed as well as the kind and dose of the radiopharmaceuticals used during the month of June 2002. The annual number of total or specific examinations was then estimated. Of the institutions sent questionnaires, 1,204 were for in vivo study, 124 were for in vitro study, and 36 were for positron emission tomography (PET) study. Out of these, 95.8% answered them. A total of 1,697 gamma cameras were installed in 1,160 facilities, of which 50% were dual-head cameras. The estimated total annual number of examinations expressed by the number of administered radiopharmaceuticals was 1.60 million, similar to that of the previous survey (1997). The frequency of study with single photon emission computed tomography (SPECT) increased to 40%, from 30% in the previous survey. The scintigraphy most frequently performed was bone (35%), followed by myocardium (24%) and brain perfusion (12%). All showed a continuous increase over the past 20 years. Tumor imaging, however, fell from third to fourth place. The most commonly used radiopharmaceutical for each scintigraphy was 99mTc-HMDP for bone, 201Tl-chloride for myocardium, 67Ga-citrate for tumor, and 123I-IMP for brain. A total of 29,376 PET studies were performed yearly. Among them, 18F-FDG rapidly increased 3.7-fold. 131I therapy for thyroid cancer and hyperthyroidism was conducted yearly in 1,647 and 3,347 patients, respectively. A total of 31.35 million in vitro radioassays were carried out yearly, the number of which has been decreasing continuously since 1992. It was proved that the content of nuclear medicine practice in Japan has changed in the past five years. This report might be useful for understanding the current trends of nuclear medicine practice in Japan.