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Estimation of absorbed dose of radiosensitive organs and effective sose in patients underwent abdominopelvic spiral CT scan using impact CT patient dosimetry
Ayoub Amirnia, Parinaz Mehnati , Nasrollah Jabbari ,
Volume 75, Issue 2 (May 2017)
Abstract

Background: Due to the presence of radiosensitive organs in the abdominopelvic region and increasing the number of requests for CT scan examinations, concerns about increasing radiation doses in patients has been greatly elevated. Therefore, the goal of this study was to determine the absorbed dose of radiosensitive organs and the effective dose in patients underwent abdominopelvic CT scan using ImPACT CT patient dosimetry Calculator (version 1.0.4, Imaging Performance Assessment on Computed Tomography, www.impactscan.org).

Methods: This prospective cross-sectional study was conducted in Imam Reza Hospital from November to February 2015 February 2015 in the Imam Reza Hospital, in Urmia, Iran. The demographic and dosimetric information of 100 patients who underwent abdominopelvic CT scan in a 6-slice CT scanner were obtained through the data collection forms. The demographic data of the patients included age, weight, gender, and BMI. The dosimetric parameters included pitch value, CT dose volume index (CTDIvol), dose-length product (DLP), tube voltage, tube current, exposure time, collimation size, scan length, and scan time. To determine the absorbed dose of radiosensitive organs and also the effective dose in patients, ImPACT CT patient dosimetry calculator was used.

Results: The results of this study demonstrated that the mean and standard deviation (SD) of patients' effective dose in abdominopelvic CT scan was 4.927±0.164 mSv. The bladder in both genders had the greatest mean organ dose, which was 64.71±17.15 mGy for men and 77.56±18.48 mGy for women (P<0.001).

Conclusion: The effective dose values of this examination are in the same range as previous studies, as well as International Commission on Radiological Protection (ICRP) recommendations. However, the radiation dose from CT scan has the largest contribution to the medical imaging. According to the ALARA principle, it is recommended that the scan parameters, especially mAs, should be chosen so that the patient dose is minimum, and the image quality is maximum. Furthermore, other imaging modalities are used as an alternative to the CT scan.

Clinical manifestations of Hirschsprung in infants in Iran
Razieh Sangsari, Kayvan Mirnia, Maryam Saeedi, Nazi Dezvaree, Fatemeh Kazerooni,
Volume 82, Issue 3 (June 2024)
Abstract
Background: Hirschsprung's disease is a major cause of functional intestinal obstruction, mainly affecting the distal region of the large intestine. Risk factors for this disease include a family history of the disease, being male, and the presence of other conditions such as cardiac or chromosomal abnormalities.
Methods: Infants admitted to Children's Medical Center Hospital, Tehran university of medical science between April 2017 to April 2021 with a diagnosis of Hirschsprung's disease were included in this study. Demographic information, clinical and radiological findings, and complications were recorded on customized forms.
Results: In this study, 29 neonates were included. The clinical manifestations of Hirschsprung in this study were failure to defecation in the first two days of birth, abdominal distention, and bilious vomiting. The most common complaint at the time of visit was constipation and vomiting, and the most common clinical finding at the time of hospitalization was abdominal distension. The most common radiological manifestation in the simple X-ray of affected neonates was the dilation of the intestinal loops and in the barium enema transitional zone. In the delayed X-ray, the delay in emptying the barium was observed. in neonate with Hirschsprung's disease Heart disease was a common comorbidity (27.2%). The most common heart disease was Atrial Septal Defect (ASD). The most histological involvement was in the rectal and rectosigmoid areas. The most common complication of Hirschsprung in the follow-up of neonates until at least 6 months of age was poor weight gain, constipation and fecal incontinence. We had three deaths, one case with Small intestine, one case with heart disease and one case with multiple anomalies.
Conclusion: The results of this study are consistent with previous research showing that genetic variations do not have a major impact on the clinical presentation of newborns with Hirschsprung's disease. While diagnostic methods like x-ray and contrast enema can be useful, biopsy is the most reliable way to confirm a diagnosis of Hirschsprung's disease. Physicians should consider performing a biopsy when evaluating a suspected case of this condition.

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