Rocksolid Light - comp.protocols.dicom - Re: MR Image 8 bits Allocated

MR Image 8 bits Allocated - allowed?

<aba5992c-4de8-41d8-a279-05ac5846ee60n@googlegroups.com>

https://news.novabbs.org/devel/article-flat.php?id=1366&group=comp.protocols.dicom#1366

copy link Newsgroups: comp.protocols.dicom

X-Received: by 2002:a05:6214:20c1:b0:4b9:f285:de7e with SMTP id 1-20020a05621420c100b004b9f285de7emr12543958qve.14.1667246551712;
Mon, 31 Oct 2022 13:02:31 -0700 (PDT)
X-Received: by 2002:a54:4114:0:b0:359:fcde:4733 with SMTP id
l20-20020a544114000000b00359fcde4733mr4658016oic.142.1667246551459; Mon, 31
Oct 2022 13:02:31 -0700 (PDT)
Path: i2pn2.org!i2pn.org!usenet.blueworldhosting.com!feed1.usenet.blueworldhosting.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: comp.protocols.dicom
Date: Mon, 31 Oct 2022 13:02:31 -0700 (PDT)
Injection-Info: google-groups.googlegroups.com; posting-host=2604:3d09:a97a:8390:409a:b9c7:5c52:a004;
posting-account=D7qLmgoAAABwBYkCerMZ_PkE-MDOl2Fe
NNTP-Posting-Host: 2604:3d09:a97a:8390:409a:b9c7:5c52:a004
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <aba5992c-4de8-41d8-a279-05ac5846ee60n@googlegroups.com>
Subject: MR Image 8 bits Allocated - allowed?
From: steve@sumost.ca (Steve Robbins)
Injection-Date: Mon, 31 Oct 2022 20:02:31 +0000
Content-Type: text/plain; charset="UTF-8"
X-Received-Bytes: 1753

by: Steve Robbins - Mon, 31 Oct 2022 20:02 UTC

Hello. I just checked the DICOM standard 2022d part 3 for the MR Image IOD specification of Bits Allocated. The specialization in C.8.3.1.1.4 reads "Enumerated Values: 16".

My understanding of "Enumerated Value" is that this specifies the list of possible values for the attribute. So, if my reading is correct, an MR Image may only have 16 bits allocated.

Am I understanding correctly?
If not, ignore what follows.

I keep coming across images with 8 bits allocated. A couple of randomly-chosen viewers honoured this and displayed the image correctly. Is this common enough that one should expect it to be supported?

If so, will 8 added to the list of Enumerated Values in the standard?

Re: MR Image 8 bits Allocated - allowed?

<1e237bb9-3f9c-4454-b6a3-9da6003c03a9n@googlegroups.com>

copy mid

https://news.novabbs.org/devel/article-flat.php?id=1368&group=comp.protocols.dicom#1368

copy link Newsgroups: comp.protocols.dicom

X-Received: by 2002:a05:620a:44c9:b0:6ed:81ba:667f with SMTP id y9-20020a05620a44c900b006ed81ba667fmr11252542qkp.92.1667260414641;
Mon, 31 Oct 2022 16:53:34 -0700 (PDT)
X-Received: by 2002:a05:6830:310d:b0:661:e4c5:1c67 with SMTP id
b13-20020a056830310d00b00661e4c51c67mr8128281ots.317.1667260414392; Mon, 31
Oct 2022 16:53:34 -0700 (PDT)
Path: i2pn2.org!i2pn.org!usenet.blueworldhosting.com!feed1.usenet.blueworldhosting.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: comp.protocols.dicom
Date: Mon, 31 Oct 2022 16:53:34 -0700 (PDT)
In-Reply-To: <aba5992c-4de8-41d8-a279-05ac5846ee60n@googlegroups.com>
Injection-Info: google-groups.googlegroups.com; posting-host=198.161.4.57; posting-account=oJk4vAoAAAAuHqwGdLwYUlL776upyWJ3
NNTP-Posting-Host: 198.161.4.57
References: <aba5992c-4de8-41d8-a279-05ac5846ee60n@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <1e237bb9-3f9c-4454-b6a3-9da6003c03a9n@googlegroups.com>
Subject: Re: MR Image 8 bits Allocated - allowed?
From: david.gobbi@gmail.com (David Gobbi)
Injection-Date: Mon, 31 Oct 2022 23:53:34 +0000
Content-Type: text/plain; charset="UTF-8"
X-Received-Bytes: 1587

by: David Gobbi - Mon, 31 Oct 2022 23:53 UTC

BitsAllocated=8 is permitted for the "Enhanced MR Image IOD" and the "Legacy Converted Enhanced MR Image IOD".

It probably won't ever be added to the old "MR Image IOD", and one should not expect viewers to support it, although many do.

For clinical DICOMs, I haven't come across images belonging to the MR Image IOD that have BitsAllocated=8.
I've only encountered them in test data sets, or as images that research groups have generated.

To be is to program.

devel / comp.protocols.dicom / Re: MR Image 8 bits Allocated - allowed?

Subject	Author
MR Image 8 bits Allocated - allowed?	Steve Robbins
MR Image 8 bits Allocated - allowed?	David Gobbi