Comments on: Dual-source CT in step-and-shoot mode: noninvasive coronary angiography with low radiation dose http://www.dsct.com/index.php/dual-source-ct-in-step-and-shoot-mode-noninvasive-coronary-angiography-with-low-radiation-dose/ International Dual-source CT Community: discuss hot topics or ask the expert your specific question about DSCT in practice Thu, 26 Aug 2010 01:26:39 +0200 http://wordpress.org/?v=2.8.4 hourly 1 By: VITA RANGASHAMANNA http://www.dsct.com/index.php/dual-source-ct-in-step-and-shoot-mode-noninvasive-coronary-angiography-with-low-radiation-dose/comment-page-1/#comment-2743 VITA RANGASHAMANNA Mon, 09 Nov 2009 05:32:17 +0000 http://www.dsct.com/?p=1084#comment-2743 sir, i am too working on a dual source siemens scanner and have done a lot of coronart angios with conventional step and shoot method and in most of the cases end up with radiation dose of 2 - 3mSV (including the calcium score). most of the times i do calcium scan with 80 KV and coronary angios with 100kv depending mainly on chest circumference and BMI.But have not yet tried reducing the effective mAS a lot since i do scans with care dose 4D on mAS will be selected automatically.if i do reduce mAS are there any standards so that the images will be not very noisy. sir,
i am too working on a dual source siemens scanner and have done a lot of coronart angios with conventional step and shoot method and in most of the cases end up with radiation dose of 2 – 3mSV (including the calcium score). most of the times i do calcium scan with 80 KV and coronary angios with 100kv depending mainly on chest circumference and BMI.But have not yet tried reducing the effective mAS a lot since i do scans with care dose 4D on mAS will be selected automatically.if i do reduce mAS are there any standards so that the images will be not very noisy.

]]> By: Hatem Alkadhi, M.D. http://www.dsct.com/index.php/dual-source-ct-in-step-and-shoot-mode-noninvasive-coronary-angiography-with-low-radiation-dose/comment-page-1/#comment-2704 Hatem Alkadhi, M.D. Thu, 24 Sep 2009 07:12:09 +0000 http://www.dsct.com/?p=1084#comment-2704 Thank you for your interest in the DSCT community. Regarding your question on brain perfusion, I cannot really give you a good answer because of no experience in this body region. In regard to <strong>cardiac imaging</strong>, I certainly can recommend the dual-source CT technology. It has proven more accurate at lower heart rates than 64-slice CT, it is - to my knowledge - the only scanner that is able to scan hearts in an accurate fashion also at higher heart rates, and finally, it must be considered very dose efficient. With a standard retrospective spiral protocol that is required in patients with high and/or irregular heart rates, you will end up with around 7-9 mSv. When you use a standard step-and-shoot protocol at 2-4 mSv (which can be used in patients with heart rates below 70 bpm), and when using the recently introduced Flash- (or high pitch) mode, you end up at a dose below 1 mSv for a coronary CT angiography examination. I have no experience with the 320-slice CT scanner for cardiac imaging. So the only thing I can recommend is to review the (sparse) literature. Here you can see that the lowest reported radiation dose of a cardiac CT using this scanner is around 5 mSv (when using a protocol that requires lowering the heart rate with beta-blockers). Best regards and good luck with your scanner choice. Hatem Alkadhi Thank you for your interest in the DSCT community.
Regarding your question on brain perfusion, I cannot really give you a good answer because of no experience in this body region.

In regard to cardiac imaging, I certainly can recommend the dual-source CT technology. It has proven more accurate at lower heart rates than 64-slice CT, it is – to my knowledge – the only scanner that is able to scan hearts in an accurate fashion also at higher heart rates, and finally, it must be considered very dose efficient. With a standard retrospective spiral protocol that is required in patients with high and/or irregular heart rates, you will end up with around 7-9 mSv. When you use a standard step-and-shoot protocol at 2-4 mSv (which can be used in patients with heart rates below 70 bpm), and when using the recently introduced Flash- (or high pitch) mode, you end up at a dose below 1 mSv for a coronary CT angiography examination.

I have no experience with the 320-slice CT scanner for cardiac imaging. So the only thing I can recommend is to review the (sparse) literature. Here you can see that the lowest reported radiation dose of a cardiac CT using this scanner is around 5 mSv (when using a protocol that requires lowering the heart rate with beta-blockers).

Best regards and good luck with your scanner choice.
Hatem Alkadhi

]]> By: Aiman Madani http://www.dsct.com/index.php/dual-source-ct-in-step-and-shoot-mode-noninvasive-coronary-angiography-with-low-radiation-dose/comment-page-1/#comment-2702 Aiman Madani Thu, 17 Sep 2009 18:58:23 +0000 http://www.dsct.com/?p=1084#comment-2702 I was reading up on the CT Siemens Daul Souce Technology and was quite impressed. I am actually a Toshiba fan and believe their 320 slice scanner is as good as it gets. So what scanner is best for brain perfusion and cardiac imaging. Dual Source vs 320 Slice I was reading up on the CT Siemens Daul Souce Technology and was quite impressed. I am actually a Toshiba fan and believe their 320 slice scanner is as good as it gets. So what scanner is best for brain perfusion and cardiac imaging. Dual Source vs 320 Slice

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