Scanning Beyond Anatomic Limits of the Thorax in Chest CT: Findings, Radiation Dose, and Automatic Tube Current Modulation

Abstract

A substantial number of extra images are acquired during chest CT that do not add clinically important information in patients with nonmalignant indications. The use of z-axis modulation increased radiation dose for the extra images.

An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose

“…MRI, ultrasound) [29] • Limit the imaging range to the area of interest, for follow-up studies in particular [44] • Prevent the extend beyond the anatomic limits (e.g., thorax, abdomen) which does not add clinically important information [7] • Position the arms above the shoulders during chest CT [45] • Position the patient precisely in the gantry [12,46,47] brain, chest and pulmonary arteries (Table 4). Compared with the control period, the average reduction in the DLP in the follow-up period was 37% for the sinuses (P<0.001), 9% for the brain (P<0.05), 24% for the chest (P<0.05), and 42% for the pulmonary arteries (P<0.001).…”

“…At the same time, radiologists and medical physicists have published many scientific manuscripts regarding low-dose CT protocols and general dose reduction strategies [7][8][9][10][11][12][13][14][15]. However, the various techniques and strategies for dose reduction are only effective if they are applied correctly.…”

Balancing Radiation Dose and Image Quality: Clinical Applications of Neck Volume CT

“…[6][7][8][9][10][11] To our knowledge, there is no published study evaluating its use in imaging of the head and neck, and no publication addresses radiation dose and image quality with 64-section multidetector row CT (MDCT). Thus, the purposes of this study were to assess whether the ATCM technique reduces radiation dose compared with the fixedtube current technique without compromising image quality in a 64-section MDCT of the neck.…”

Ką Turėtume Žinoti Apie Medicininę Apšvitą?

“…Jis pasirenkamas pagal keliamus klinikinius uždavinius, pavyzdžiui, krūtinės ląstos srities KT tyrimas įtariant PATE, intersticinę plaučių ligą ar vertinant plaučių vėžio išplitimą reikšmingai skiriasi [49,50,51]. Tyrimo protokolas numato tyrimo apimtį, pasirenkami techniniai skenavimo parametrai, nusprendžiama, ar reikės specialaus paciento paruošimo, intraveninio, peroralinio ar kt.…”

“…Kai kurių autorių duomenimis, net 35,8 procento atliekamų KT tyrimo fazių nėra pagrįs-tos [52]. Skenavimo apimtis tiesiogiai proporcinga gautai apšvitos dozei, pvz., atliekant širdies KT tyrimus, tyrimo lauką sumažinus 1 cm, apšvita gali būti sumažinama iki 1 mSv [45,47,48,51]. Todėl akivaizdu, jog tiriant dėl plaučių arterijos embolijos, tiriamoji sritis neturėtų būti tokia, kaip vertinant plaučių vėžio išplitimą.…”